Free Course Image Geometry Course

Free online courseGeometry Course

Duration of the online course: 31 hours and 17 minutes

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Master High School Geometry concepts online for free with this comprehensive course covering points, lines, planes, angles, transformations, proofs, and more.

In this free course, learn about

  • Getting Ready for Geometry
  • Foundations of Geometry and Coordinate Basics
  • Logic, Proofs, and Reasoning in Geometry
  • Lines, Angles, and Coordinate Geometry
  • Triangles, Congruence, and Coordinate Proof
  • Triangle Centers, Inequalities, and Pythagorean Theorem
  • Polygons and Quadrilaterals
  • Similarity and Proportional Reasoning
  • Right Triangle Trigonometry and Vectors
  • Transformations, Symmetry, and Tessellations
  • Area, Perimeter, and Probability in the Plane
  • Three-Dimensional Geometry and Volume
  • Circles and Their Properties
  • Counting, Probability, and Data in Geometry

Course Description

Welcome to the Geometry Course, a comprehensive and in-depth program designed to provide a strong foundation in Geometry. With an engaging duration of 31 hours and 17 minutes, this course is meticulously crafted for students looking to solidify their understanding and prepare for high school geometry. It belongs to the category of Basic Studies and falls under the subcategory of Geometry.

This course begins by addressing the fundamental question: "Are you ready for High School Geometry?". It progressively builds upon topics starting from understanding points, lines, and planes, and moves forward to more complex areas such as measuring and constructing segments, and pairs of angles. You will gain a deep comprehension of perimeter, area, and circumference, and learn to utilize geometric formulas effectively.

As you delve deeper, the course will guide you through the intricacies of the coordinate plane, including transformations, midpoint, and distance calculations. The exploration of inductive and deductive reasoning, along with conditional statements and proofs, will enhance your logical thinking and problem-solving abilities.

The geometry of lines is thoroughly covered, from parallel, perpendicular, and skew lines to corresponding angles postulates. You'll learn about constructing various lines and segments, calculating slopes, and mastering point-slope form alongside graphing equations.

Triangles are a significant focus, where you'll classify triangles, understand the Triangle Sum Theorem, and work on congruence theorems like Side-Side-Side, Angle-Side-Angle, and more. The properties of congruent polygons and conditions for parallel and perpendicular lines are elucidated with practical exercises.

The course also navigates through the key theorems related to polygons and parallelograms. It covers a range of properties for rectangles, rhombuses, squares, and kites. Conditions and constructions using a compass and straightedge are integral parts of the learning process.

One cannot overlook the concept of similarity in geometry, which is extensively covered, including the dilation and proportionality theorems. Trigonometric ratios such as sine, cosine, and tangent are elaborated upon, along with their applications and inverse functions. You will also solve right triangles and explore the Law of Sines and Cosines.

Transformations in the coordinate plane capture various reflections, translations, and rotations, culminating in compositions of transformations and understanding symmetry. The study of circles is robust, addressing chords, secants, tangents, arc lengths, and inscribed angles. The comprehensive look into three-dimensional figures will help you classify and analyze their properties and volumes.

Towards the end, the course introduces probability and counting principles. You will delve into permutations, combinations, and various probability events, rounding out your geometric knowledge and analytical capabilities.

This expansive Geometry Course ensures a thorough understanding of each topic, preparing you for further mathematical studies and practical applications. Begin your geometric journey today and build a strong academic foundation with us!

Course content

  • Video class: Are you ready for High School Geometry? 01m
  • Exercise: Which theorem is used to find the relationship between the sides of a right triangle?
  • Video class: Geometry 1.1, Understanding points, lines, and planes 09m
  • Exercise: Understanding Basic Geometry Terms: Points, Lines, and Planes
  • Video class: Geometry 1.2, Measuring and constructing segments 17m
  • Exercise: What is the distance between two points on a line based on their coordinates?
  • Video class: Geometry 1.3, Measuring 22m
  • Exercise: How can an angle be named?
  • Video class: Geometry 1.4, Pairs of angles 14m
  • Exercise: What is the measure of the larger angle in a complementary angle pair with a 1:2 ratio?
  • Video class: Geometry 1.5, Using Formulas in Geometry, Perimeter, Area, Circumference 14m
  • Exercise: What is the formula for the area of a triangle?
  • Video class: Geometry 1.6, Midpoint and Distance in the Coordinate Plane 16m
  • Exercise: How to find the midpoint of a segment on a coordinate plane?
  • Video class: Geometry 1.7, Transformations in the Coordinate Plane 13m
  • Exercise: Which of the following transformations would NOT change the orientation of a figure on the coordinate plane?
  • Video class: Geometry 2.1, Inductive Reasoning 15m
  • Exercise: What is the next number in the pattern: 5, 10, 15, 20, 25?
  • Video class: Geometry 2.2a, Conditional Statements, IF,THEN p?q 13m
  • Exercise: Understanding Conditional Statements
  • Video class: Geometry 2.2b, More examples of Conditionals, Converse, Inverse, Contrapositive 06m
  • Exercise: What is the contrapositive of the statement "If the bird can fly, then the bird has wings"?
  • Video class: Geometry 2.3a, Using Deductive reasoning to verify conjectures 12m
  • Exercise: What type of reasoning is used to conclude an egg-balancing myth is false?
  • Video class: Geometry 2.3b, Using Deductive reasoning to solve Logic puzzles 11m
  • Exercise: Logic Puzzle: Who likes which superhero?
  • Video class: Geometry 2.4, Biconditional statements 10m
  • Exercise: What is the nature of a biconditional statement in logic?
  • Video class: Geometry 2.5, Algebraic Proof and justifying each step 14m
  • Exercise: Which property of equality states that if a equals b, then b can be substituted for a in any expression?
  • Video class: Geometry 2.6a, Geometric Proof for a two-column proof 13m
  • Exercise: What is the definition of complementary angles?
  • Video class: Geometry 2.6b, Design plans for two-column proofs 09m
  • Exercise: What is the Common Angles Theorem about?
  • Video class: Geometry 2.7a, Read 15m
  • Exercise: What is a flowchart proof in geometry?
  • Video class: Geometry 2.7b, Read 14m
  • Exercise: What is the vertical angles theorem about?
  • Video class: Geometry 2.7c, Intro to Symbolic Logic, Conjunctions 12m
  • Exercise: What is a compound statement that uses 'AND' called?
  • Video class: Geometry 3.1a, Parallel, Perpendicular, and Skew lines 06m
  • Video class: Geometry 3.1b, Angle pairs formed by a Transversal 09m
  • Exercise: Which of the following statements correctly describes the characteristics of alternate interior angles formed when a transversal intersects two coplanar lines?
  • Video class: Geometry 3.1c, Find angle measures with Systems of Equations 10m
  • Video class: Geometry 3.2a, Corresponding Angles Postulate and Parallel lines 08m
  • Video class: Geometry 3.2b, Parallel lines 11m
  • Video class: Geometry 3.3a, Converse of the Corresponding angles postulate 10m
  • Video class: Geometry 3.3b, Proving lines parallel 11m
  • Video class: Geometry 3.3c, Rhombus Method to construct parallel lines 03m
  • Video class: Geometry 3.4a, Construct a Perpendicular bisector of a segment 05m
  • Exercise: What is the definition of a perpendicular bisector of a segment in geometry?
  • Video class: Geometry 3.4b, Perpendicular Transversal Theorem 10m
  • Video class: Geometry 3.4c, Construct Perpendicular line to a given line through a given point 03m
  • Video class: Geometry 3.5a, Rise, Run, and finding the Slope of a line 14m
  • Video class: Geometry 3.5b, Slopes of Parallel and Perpendicular lines 09m
  • Video class: Geometry 3.6a, Point-slope form 09m
  • Video class: Geometry 3.6b, Graphing the equation of a line 08m
  • Video class: Geometry 3.6c, Pairs of lines 10m
  • Exercise: What is the result of solving a system of two linear equations in two variables where the equations are _exactly_ the same?
  • Video class: Geometry 3.6d, Scatter plots 07m
  • Video class: Geometry 4.1a, Drawing 08m
  • Video class: Geometry 4.1b, Transformations in the Coordinate Plane 07m
  • Video class: Geometry 4.2a, Classifying triangles by angle or side 10m
  • Video class: Geometry 4.2b, Construct an Equilateral triangle with a compass 03m
  • Video class: Geometry 4.3a, Triangle Sum Theorem 09m
  • Video class: Geometry 4.3b, Two Corollaries from the Triangle Sum Theorem 05m
  • Exercise: According to the corollaries following the triangle sum theorem, what is the measure of an angle in an equiangular triangle?
  • Video class: Geometry 4.3c, Exterior Angles Theorem 10m
  • Video class: Geometry 4.4, Properties of Congruent Polygons 14m
  • Video class: Geometry 4.5a, Side-Side-Side (SSS) congruence, Triangle rigidity 07m
  • Video class: Geometry 4.5b, Side-Angle-Side (SAS) congruence 13m
  • Video class: Geometry 4.6a, Angle-Side-Angle (ASA) Congruence 11m
  • Video class: Geometry 4.6b, Angle-Angle-Side (AAS) Congruence 08m
  • Video class: Geometry 4.6c, Hypotenuse-Leg (HL) Congruence Theorem 07m
  • Exercise: Which of the following statements correctly applies the Hypotenuse-Leg (HL) congruence theorem?
  • Video class: Geometry 4.6d, Construct a Right triangle with a compass and straightedge 02m
  • Video class: Geometry 4.7a, CPCTC Triangle Congruence 11m
  • Video class: Geometry 4.7b, Proving the Parallel 11m
  • Video class: Geometry 4.7c, Quadratic equation for side length of a triangle 05m
  • Video class: Geometry 4.8, Coordinate Proof 10m
  • Video class: Geometry 4.9a, Isosceles Triangle Theorem 10m
  • Video class: Geometry 4.9b, Equilateral 06m
  • Exercise: What is the measure of each angle in an equiangular triangle?
  • Video class: Geometry 4.9c, Congruent Triangles to prove Constructions valid 09m
  • Video class: Geometry 5.1a, Perpendicular Bisector Theorem 07m
  • Video class: Geometry 5.1b, Angle Bisector Theorem 09m
  • Video class: Geometry 5.2a, Circumcenter of a Triangle 09m
  • Video class: Geometry 5.2b, Incenter Theorem, Inscribed Circles, and Angle Bisectors (New Version) 08m
  • Video class: Geometry 5.3a, Centroid Theorem 09m
  • Video class: Geometry 5.3b, Altitude of a Triangle 07m
  • Exercise: What is the orthocenter of a triangle?
  • Video class: Geometry 5.4a, The Triangle Midsegment Theorem 10m
  • Video class: Geometry 5.4b, Construct the Midsegment of a triangle with a compass 02m
  • Video class: Geometry 5.4c, Review - Solving Compound Inequalities 07m
  • Video class: Geometry 5.5a, Write an Indirect Proof 11m
  • Video class: Geometry 5.5b, Triangle Inequality Theorem 12m
  • Video class: Geometry 5.6a, Hinge Theorem 15m
  • Video class: Geometry 5.6b, Simplest Radical Form, Quick Review 05m
  • Exercise: According to the review of radicals, what condition must the radicand of a square root in simplest form satisfy?
  • Video class: Geometry 5.7a, Pythagorean Theorem 13m
  • Video class: Geometry 5.7b, Justify the Pythagorean Theorem by building 2D figures 05m
  • Video class: Geometry 5.7c, Converse of the Pythagorean Theorem 05m
  • Video class: Geometry 5.7d, Pythagorean Inequalities Theorem 06m
  • Video class: Geometry 5.8a, 45°-45°-90° Triangle Theorem 07m
  • Video class: Geometry 5.8b, 30°-60°-90° Triangle Theorem 09m
  • Video class: Geometry 5.8c, Graph Irrational Numbers on a number line w/compass 05m
  • Exercise: Which mathematical concept allows us to construct the exact location of irrational numbers on a number line?
  • Video class: Geometry 6.1a, Identifying 08m
  • Video class: Geometry 6.1b, Polygon Angle Sum Theorem 05m
  • Video class: Geometry 6.1c, Polygon Exterior Angle Sum Theorem 05m
  • Video class: Geometry 6.1d, Relations 05m
  • Video class: Geometry 6.1e, Construct regular polygons with a compass 09m
  • Video class: Geometry 6.2a, 4 Theorems of the Properties of Parallelograms 09m
  • Video class: Geometry 6.2b, Parallelograms in the Coordinate Plane 08m
  • Exercise: Which statement is not true about the properties of a parallelogram based on the given text?
  • Video class: Geometry 6.3a, Conditions for Parallelograms 11m
  • Video class: Geometry 6.3b, Proving Parallelograms in the Coordinate Plane 06m
  • Video class: Geometry 6.4a, Properties of Rectangles 04m
  • Video class: Geometry 6.4b, Properties of Rhombuses 08m
  • Video class: Geometry 6.4c, Properties of Squares 09m
  • Video class: Geometry 6.4d, Construct a Rhombus with a compass 03m
  • Video class: Geometry 6.5a, Conditions for Rectangles 07m
  • Exercise: According to the theorems provided for classifying parallelograms, which condition ensures that a parallelogram is definitively a rectangle?
  • Video class: Geometry 6.5b, Apply 08m
  • Video class: Geometry 6.6a, Properties of Kites 15m
  • Video class: Geometry 6.6b, Isosceles Trapezoids 13m
  • Video class: Geometry 6.6c, Construct a Kite with a compass and straightedge 02m
  • Video class: Geometry 7.1, Ratios in Similar Polygons 09m
  • Video class: Geometry 7.2a, Dilations 08m
  • Video class: Geometry 7.2b, Proving Circles Similar 05m
  • Exercise: Which transformation can you use to prove that two circles are similar?
  • Video class: Geometry 7.3a, AA, SSS, SAS Triangle Similarity 08m
  • Video class: Geometry 7.3b, Proofs with Similar Triangles 07m
  • Video class: Geometry 7.3c, Proving the Pythagorean Theorem using Similar Triangles 08m
  • Video class: Geometry 7.4a, Triangle Proportionality Theorem 08m
  • Video class: Geometry 7.4b, Two-Transversal Proportionality Corollary 08m
  • Video class: Geometry 7.4c, Triangle Angle Bisector Theorem 04m
  • Video class: Geometry 7.5a, Indirect Measurement 07m
  • Exercise: Which of the following proportions correctly represents the relationship between the heights and shadows of Tala and the pineapple statue according to the principle of similar triangles?
  • Video class: Geometry 7.5b, Proportional Perimeters and Areas Theorem 07m
  • Video class: Geometry 7.6a, Dilations 12m
  • Video class: Geometry 7.6b, Segment Partition 04m
  • Video class: Geometry 7.6c, Direct Variation 04m
  • Video class: Geometry 8.1, Similarity in Right Triangles 10m
  • Video class: Geometry 8.2a, Trigonometric Ratios, introducing Sine, Cosine, Tangent 07m
  • Video class: Geometry 8.2b, Finding 12m
  • Exercise: If an angle of a right triangle has a tangent ratio of 2/3, what is the ratio of the length of the opposite leg to the adjacent leg for that angle?
  • Video class: Geometry 8.2c, Calculating Trig Ratios with a Trig Table 07m
  • Video class: Geometry 8.2d, Trigonometric Ratios 05m
  • Video class: Geometry 8.2e, Inverse Functions 05m
  • Video class: Geometry 8.3a, Identify 07m
  • Video class: Geometry 8.3b, Solving Right Triangles, find 3 sides 10m
  • Video class: Geometry 8.4a, Angle of Elevation 12m
  • Video class: Geometry 8.4b, Indirect Measurement using a homemade Clinometer 06m
  • Exercise: Which formula represents the correct method to calculate the height of a tall object using a clinometer and trigonometry?
  • Video class: Geometry 8.5a, Find Trig ratios for obtuse angles with a scientific calculator 02m
  • Video class: Geometry 8.5b, Law of Sines 10m
  • Video class: Geometry 8.5c, Law of Cosines 14m
  • Video class: Geometry 8.6a, Vectors, component form, magnitude, direction 10m
  • Video class: Geometry 8.6b, Equal vectors, parallel vectors, Vector addition, and resultant vectors 12m
  • Video class: Geometry 9.1a, Reflections 09m
  • Video class: Geometry 9.1b, The rules for reflections in a coordinate plane 10m
  • Exercise: What happens to the coordinates of a point when it is reflected across the y-axis in a coordinate plane?
  • Video class: Geometry 9.2a, Identifying Translations 07m
  • Video class: Geometry 9.2b, Drawing Translations in the coordinate plane 09m
  • Video class: Geometry 9.2c, Transformations of Functions 05m
  • Video class: Geometry 9.3a, Identifying Rotations 09m
  • Video class: Geometry 9.3b, Drawing rotations in the coordinate plane 10m
  • Video class: Geometry 9.4, Compositions of Transformations and Glide Reflections 15m
  • Video class: Geometry 9.5a, Lines of Symmetry 15m
  • Exercise: Which of the following figures does not have any line of symmetry?
  • Video class: Geometry 9.5b, Solids of Revolution, Cylinder, Cone, Sphere, Torus 05m
  • Video class: Geometry 9.6a, Frieze Patterns and Translation Symmetry 10m
  • Video class: Geometry 9.6b, Tessellations, Regular, Semi-regular, or neither 08m
  • Video class: Geometry 9.7a, Dilations: Identify, Construct 18m
  • Video class: Geometry 9.7b, Order of Right Triangle Transformations 09m
  • Video class: Geometry 9.7c, Translate or Dilate, make solids, 2D pancakes 09m
  • Video class: Geometry 10.1a, Literal Equations 06m
  • Exercise: In Emma's problem, if she uses 50 feet of fencing to build a dog run and the width (w) is increased from 10 feet to 12 feet, how many feet will the length (l) be?
  • Video class: Geometry 10.1b, Area Addition Postulate 08m
  • Video class: Geometry 10.1c, Area of Triangles 10m
  • Video class: Geometry 10.1d, Area of Rhombuses 13m
  • Video class: Geometry 10.2a, Develop Pi or Construct to estimate Pi ? 10m
  • Video class: Geometry 10.2b, Circumference 10m
  • Video class: Geometry 10.2c, Area of Regular Polygons with the Apothem 09m
  • Video class: Geometry 10.3a, Composite Figures 16m
  • Exercise: Which formula is used to find the area of a trapezoid?
  • Video class: Geometry 10.3b, Triangle Area Formulas unknown height, Heron's Formula 07m
  • Video class: Geometry 10.4, Perimeter 12m
  • Video class: Geometry 10.5, Effects of changing Dimensions Proportionally 15m
  • Video class: Geometry 10.6a, Probability 09m
  • Video class: Geometry 10.6b, Geometric Probability 17m
  • Video class: Geometry 10.6c, Use Geometric Probability to estimate pi 06m
  • Video class: Geometry 11.1a, Three-dimensional figures (and properties of) 08m
  • Exercise: Which of the following statements is true regarding the properties of three-dimensional figures?
  • Video class: Geometry 11.1b, Classify, Identify, Three-dimensional figure from a net 07m
  • Video class: Geometry 11.1c, Cross sections of Three-dimensional figures 09m
  • Video class: Geometry 11.2a, Volume of Prisms 13m
  • Video class: Geometry 11.2b, Volume of Cylinders 12m
  • Video class: Geometry 11.2c, Finding Volumes of Composite 3D figures 11m
  • Video class: Geometry 11.3a, Volume of Pyramids 14m
  • Video class: Geometry 11.3b, Volume of Cones 11m
  • Exercise: What formula is used to calculate the volume of a cone?
  • Video class: Geometry 11.3c, Cube roots 06m
  • Video class: Geometry 11.4a, Volume of a Sphere or Hemisphere 09m
  • Video class: Geometry 11.4b, Surface Area of a Sphere 13m
  • Video class: Geometry 12.1a, Introducing Chord, Secant, Tangent, lines that intersect circles 05m
  • Video class: Geometry 12.1b, Congruent, Concentric, and Tangent Circles 11m
  • Video class: Geometry 12.1c, Construct a tangent to a circle at a point 02m
  • Video class: Geometry 12.1d, Make a Circle Graph from data 04m
  • Exercise: What is the formula to calculate the central angle measure of a given category in a circle graph?
  • Video class: Geometry 12.2a, Major Arc, Minor Arc, Arc Addition Postulate 09m
  • Video class: Geometry 12.2b, Congruent angles, arc, chords 13m
  • Video class: Geometry 12.3a, Sector of a circle 06m
  • Video class: Geometry 12.3b, Area of a Segment of a circle 07m
  • Video class: Geometry 12.3c, Arc length of a Circle 06m
  • Video class: Geometry 12.3d, Introducing Radians 12m
  • Video class: Geometry 12.4a, Inscribed angle, intercepted arc, subtends 14m
  • Exercise: According to the inscribed angle theorem, what is the relationship between the measure of an inscribed angle and the measure of its intercepted arc?
  • Video class: Geometry 12.4b, Inscribed Triangle, Inscribed Quadrilateral 09m
  • Video class: Geometry 12.4c, Construct the Center of a circle w/compass 04m
  • Video class: Geometry 12.4d, Construct tangent to a circle from an exterior point 03m
  • Video class: Geometry 12.5a, Find measures using Tangents and Secants 11m
  • Video class: Geometry 12.5b, Angle relationships in circles 08m
  • Video class: Geometry 12.6a, Chord-Chord Product Theorem 04m
  • Video class: Geometry 12.6b, Secant-Secant Product Theorem 05m
  • Exercise: According to the Secant-Secant Product Theorem, what is the relationship between two secants that intersect outside of a circle?
  • Video class: Geometry 12.6c, Secant-Tangent Product Theorem 06m
  • Video class: Geometry 12.7, Circles in the Coordinate plane 08m
  • Video class: Geometry 13.1a, Fundamental Counting Principle 05m
  • Video class: Geometry 13.1b, Introducing Permutations 11m
  • Video class: Geometry 13.1c, Combinations of a set 08m
  • Video class: Geometry 13.1d, Relative Area 05m
  • Video class: Geometry 13.2a, Theoretical Probability 12m
  • Exercise: What is the probability of spinning a spinner divided into four equal parts and landing on a predetermined color, if each color has an equal chance of being landed on?
  • Video class: Geometry 13.2b, Geometric Probability 17m
  • Video class: Geometry 13.3a, Probability of Independent Events 07m
  • Video class: Geometry 13.3b, Probability of Dependent Events 10m
  • Video class: Geometry 13.3c, Use a table to find Conditional Probability P(A and B) 14m
  • Video class: Geometry 13.3d, Determine if events are Independent or Dependent 06m
  • Video class: Geometry 13.4a, Joint relative frequency 06m
  • Video class: Geometry 13.4b, Conditional Relative Frequency 11m
  • Exercise: What describes the calculation of conditional relative frequency in a two-way table?
  • Video class: Geometry 13.5a, Simple event, Compound event, Mutually exclusive events 07m
  • Video class: Geometry 13.5b, Probability of Inclusive Events 14m

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