# Triangle Congruency Postulates for dtech

- Author:
- Ilene, Eric Smith

- Topic:
- Congruence

Hey dtech Geometry students!
Let's see how many different (non-congruent) triangles that we can create given certain circumstances.
Move the red dots around to try create different triangles. This will take a bit of practice. You can also change the shape of the original triangle, so try changing it's shape.
A green triangle represents congruent triangles and orange triangles represent non-congruent triangles.

Copy and Answer these questions on page 2 of your Exit Ticket 4.1
1. Why is it ....that when all the sides of a triangle are the same length as another triangle, then both triangles MUST be congruent?
2. What does SAS mean? Even further, explain what Congruence by Side-Angle-Side means...
3. Which one of these: SSS, SAS, SSA, AAA does NOT help you prove that two triangles are congruent?