Khan Academy
Khan Academy: Geometry: Sum of the Exterior Angles of Convex Polygon
Demonstrates how to determine that the exterior angle sum of a convex polygon is 360 degrees. Practice problems available. [5:24]
Khan Academy
Khan Academy: Geometry: Proof Vertical Angles Are Equal
Proof that the measures of vertical angles are equal based on properties of supplementary angles. [4:51]
Khan Academy
Khan Academy: Geometry: Language and Notation of the Circle
Formally defines a circle and different parts of a circle. Identifies the proper notation for naming different parts of a circle. [11:12]
Khan Academy
Khan Academy: Geometry: Similarity Postulates
Explains the minimum amount of information needed to determine if two triangles are similar. Names and illustrates the similarity postulates: AA, SSS, and SAS. [12:14]
Khan Academy
Khan Academy: Geometry: Equilateral and Isosceles Example Problems
Demonstrates how to use the triangle sum theorem, properties of equilateral and isosceles triangles, and special angle pairs to determine the unknown measures of angles in three different diagrams. [6:27]
Khan Academy
Khan Academy: Geometry: The Pythagorean Theorem
This video tutorial is n introduction to the Pythagorean theorem. The instructor explains how to use the Pythagorean theorem to find the length of the hypotenuse or the length of one of the legs. At the end of the video, practice...
Khan Academy
Khan Academy: Geometry: Example Involving Isosceles Triangle and Parallel Lines
Demonstrates how to use the triangle sum theorem, properties of isosceles triangles, and special angle pairs formed when parallel lines are cut by a transversal to set up an equation using given algebraic expressions for angle measures...
Khan Academy
Khan Academy: Geometry: Angles at the Intersection of Two Lines
Explains how to determine the measures of angles formed by interecting lines when given the measure of one angle. [7:19]
Khan Academy
Khan Academy: Geometry: Congruent Parts of Iscosceles Triangles
Proof that if the legs of an isosceles triangle are congruent then the base angles are congruent and vice versa using triangle congruency postulates. The proof is written as a two-column proof. [9:03]
Khan Academy
Khan Academy: Geometry: Other Triangle Congruence Postulates
In this video tutorial [13:28], the instructor identifies the different triangle congruency postulates: SSS, SAS, ASA, AAS. Practice problems available.
Khan Academy
Khan Academy: Geometry: Challenging Triangle Angle Problem
Demonstrates how to find the sum of the exterior angles of an irregular pentagon by breaking the pentagon into three triangles and using the triangle sum theorem. [8:37]
Khan Academy
Khan Academy: Geometry: Similar Triangle Basics
Explains the difference between congruent triangles and similar triangles. Introduces the idea of scale factors. [9:17]
Khan Academy
Khan Academy: Geometry: Another Isosceles Example Problem
Explains how to use given algebraic expressions for the measures of angles in an isosceles triangle and apply knowledge of the triangle sum theorem and the knowledge that the base angles of an isosceles triangle are congruent to...
Khan Academy
Khan Academy: Geometry: Congruent Triangles and Sss
In this video tutorial [11:29], the instructor explains how to use triangle congruence to identify measures of corresponding sides and angles in triangles. Defines side-side-side (SSS) postulate. Practice problems available.
Khan Academy
Khan Academy: Geometry: Circumcenter of a Triangle
Explains using multiple proofs that a point on a perpendicular bisector is equidistant from the endpoints of the segment it bisects. Proofs use triangle congruency postulates. Lays the foundation for understanding the circumcenter of a...
Khan Academy
Khan Academy: Geometry: Area of a Regular Hexagon
This video [7:50] demonstrates how to determine the area a regular hexagon with side length of 2 sq. rt. 3 based on knowledge of 30-60-90 triangles and the area formula of a triangle.
Khan Academy
Khan Academy: Geometry: Inscribed and Central Angles
Proof that the measure of an inscribed angle is half the measure of a central angle when the angles intercept the same arc. [14:16]
Khan Academy
Khan Academy: Geometry: Congruent Triangle Example 2
Demonstrates how to use triangle congruency to prove that corresponding sides of congruent triangles are congruent and then identifies other congruent parts in the overlapping triangle diagram. The proof is written in the form of a...
Khan Academy
Khan Academy: Geometry: Medians Divide Into Smaller Triangles of Equal Area
This video tutorial [7:46] demonstrates that the three medians of a triangle divide it into six smaller triangles with equal areas.
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: 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: Terms & Labels in Geometry
Learn about geometry terms like point, line, and ray. We will also learn how to label them.
Math Planet
Math Planet: Geometry: Triangles
Discussion of triangles through the use of examples and a video lesson. [1:08]
Loyola University Chicago
Math Flix: Similar Figures: Proof Using Proportions
This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by checking to see if figures are proportionaly similar. As you watch and listen to the teacher and student interact it helps clarify the thinking...
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