Khan Academy
Khan Academy: Triangles: Congruent Triangles and Sss
This video tutorial explains how to use triangle congruence to identify measures of corresponding sides and angles in triangles. Defines side-side-side (SSS) postulate.
Khan Academy
Khan Academy: Basic Triangle Proofs Module Example 2
A video proving that the given triangles are congruent by ASA.
Khan Academy
Khan Academy: Using Similar & Congruent Triangles
Sal uses the similarity of triangles and the congruence of others in this multi-step problem to find the area of a polygon.
Sophia Learning
Sophia: Sas Triangle Congruence: Lesson 1
This lesson will explain that demonstrating that two pairs of sides are equal in length and that the included angles are equal will show that two triangles are congruent. It is 1 of 5 in the series titled "SAS Triangle Congruence." [1:48]
Sophia Learning
Sophia: Equilateral Triangle Interior Angles Practice Problems: Lesson 2
This lesson will provide practice problems that involve solving for unknown angle and side measures of equilateral triangles. It is 2 of 5 in the series titled "Equilateral Triangle Interior Angles Practice Problems."