Warm-up

- From the diagram above, create a similarity statement and give a reason for your statement.
- If x/y=a/b and a=c, create another valid proportion involving c.
- Create a diagram where GH bisects angle EGF
- What is the supplement of 76ยบ?

What can you say about lines *x* and *y *in the diagram above? Why?

**Angle Bisector Theorem**

We then worked through a worksheet that guided students through a proof of the Angle Bisector Theorem: Angle Bisector Theorem- Guided Proof