# Triangle Congruence

- Author:
- Judith Hilinski

- Topic:
- Congruence

## What does "congruent" triangles mean?

**A congruent triangle means that one triangle shape can fit exactly over another using Turns, Flips and Slides**

**Congruent Triangles**

When two triangles are congruent they will have exactly

**the same side measures (all 3 sides),**and the**same angle measures (all 3 angles).**The equal sides and angles may not be in the same position (if there is a turn of a flie), but they are there.**Same Sides**

**When the sides are the same then the triangles are congruent.**

**Same Angles**

**Does this also work with angles? Not always!**

**Marking**

**When two triangles are congruent we often mark corresponding sides and angles like this:**

**The sides marked with one line are equal in length. Similarly for the sides marked with two lines. Also for the sides marked with three lines.**

**The angles marked with one arc are equal in size. Similarly for the angles marked with two arcs. Also for the angles marked with three arc.**

**Your Turn!**

**Choose the correct answer**

**Choose the correct answer**

**Choose the correct answer**

**Which one of the following statements is NOT sufficient to determine whether or not two triangles P and Q are congruent?**