SAS: Dynamic Proof!

How it works ?

1. The SAS Triangle Congruence Theorem states that if 2 sides and their included angle of one triangle are congruent to 2 sides and their included angle of another triangle, then those triangles are congruent. The applet below uses transformational geometry to dynamically prove this very theorem.
2. Interact with this applet below for a few minutes, then answer the questions that follow.
3. As you do, feel free to move the BIG WHITE POINTS anywhere you’d like on the screen!