# SAS - Exercise 2

In the applet below, use the tools of transformational geometry to informally demonstrate the SAS Triangle Theorem to be true.
That is, use the tools of transformational geometry to map the

**yellow triangle**onto the empty triangle. Before starting, feel free to adjust any aspect of the**starting triangle**(**tilt**,**size of the included angle**,**and the positions of points***A***,***B***, and***C*). You can also use the**black slider**to**change the position of the image (empty) triangle.***Once you do start, it is recommended that you don't readjust these parameters.*## FOR TEACHERS: (Quick 2 Minute Demo + Teaching Reflection)

## Question:

In a sentence or two, describe what you did to prove that these 2 triangles are indeed congruent. How do we know these triangles are indeed congruent?