Khan Academy
Khan Academy: Worked Examples: Geometry: Ca Geometry: Proof by Contradiction
Students explore how to do a geometric proof by contradiction.
National Science Foundation
National Science Foundation: Science of Nhl Hockey: Hockey Geometry & Science
This 10-part video series explores the science and math behind professional hockey.
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Euclid the Father of Geometry
In this video students learn about Euclid and his Elements (and how much Abraham Lincoln liked them).
Khan Academy
Khan Academy: Right Triangle Geometry Harder Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a harder right triangle trigonometry problem.
Khan Academy
Khan Academy: Right Triangle Geometry Basic Example
The video from Khan Academy provides practice questions for the SAT. Students will watch Sal work through a basic right triangle trigonometry problem.
Khan Academy
Khan Academy: Worked Examples: Geometry: Geometry: Triangles and Parallelograms
Students explore the properties of triangles and parallelograms in this video tutorial.
Khan Academy
Khan Academy: Worked Examples: Geometry: Pythagorean Theorem, Area
Students watch a video tutorial to learn how to solve area problems of composite figures using the Pythagorean Theorem.
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Lines, Line Segments, and Rays
In this video the students explore the difference between lines, line segments, and rays.
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Identifying Rays
In this video students learn about the key aspects of rays.
Khan Academy
Khan Academy: Geometry: Perimeter and Area of a Non Standard Polygon
Explains how to find the perimeter and area of a non-standard, or irregular polygon. [3:03] CCSS.Math.Content.3.MD.C.7.d Recognize area as additive.
Khan Academy
Khan Academy: Geometry: Part 1 of Proof of Heron's Formula
Demonstrates how to derive a version of Heron's formula using the Pythagorean Theorem and the formula for the area of a triangle. Applies Heron's formula to solve a sample problem. [10:59]
Khan Academy
Khan Academy: Geometry: Proof: Opposite Sides of Parallelogram Congruent
Demonstrates how to prove that the opposite sides of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [8:30]
Khan Academy
Khan Academy: Geometry: Part 2 of the Proof of Heron's Formula
Completes the proof of Heron's formula that was begun in the video, "Part 1 of Proof of Heron's Formula." [12:08]
Khan Academy
Khan Academy: Worked Examples: Geometry: Interesting Perimeter and Area Problems
Students explore three example problems involving perimeter and area of complex shapes.
Khan Academy
Khan Academy: Geometry: Angles Formed by Parallel Lines and Transversals
Identifies which angles are congruent when parallel lines are cut by a transversal. [7:07]
Khan Academy
Khan Academy: Geometry: Proof: Opposite Angles of Parallelogram Congruent
This video tutorial demonstrates how to prove that the opposite angles of a parallelogram are congruent based on knowledge of the special angles created when parallel lines are cut by a transversal. [4:08]
Khan Academy
Khan Academy: Geometry: Euler's Line Proof
Proves that the circumcenter, orthocenter, and centroid all lie on the same line, the Euler line. Proof relies on understanding of properties of similar triangles and properties of special parts of a triangle. [9:50]
Khan Academy
Khan Academy: Geometry: Proof: Diagonals of Parallelogram Bisect Each Other
Demonstrates how to prove that the diagonals of a parallelogram bisect each other based on knowledge of the special angles created when parallel lines are cut by a transversal and the triangle congruency postulates. [9:06]
Math Mammoth
Math Mammoth: Pythagorean Theorem and Geometry 1: Area of an Isosceles Triangle
This video demonstrates how to find the area of an isosceles triangle by first determining the altitude using the Pythagorean Theorem. [3:53]
Khan Academy
Khan Academy: Geometry: Perimeter of a Polygon
Shows how to find the perimeter of a parallelogram. [1:20]
Khan Academy
Khan Academy: Geometry: Lines, Line Segments, and Rays
Compares qualities of line segments, lines, and rays. Practice problems available. [3:38]
Khan Academy
Khan Academy: Geometry: Volume of a Sphere
Explains how to calculate the volume of a sphere. [2:35]
Khan Academy
Khan Academy: Introduction to Euclidean Geometry: Language of the Circle
In this video student learn formal definition of a circle including tangent and secant lines, diameters, radii, major and minor arcs.
Khan Academy
Khan Academy: 2. Geometry of Rotation
Next lets build a diagram that break rotation into smaller parts. The next exercise will give us a chance to build our understanding of this diagram. Click here to learn about rotation using linear transformations
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