Students will learn what the isosceles triangle theorem says, why it's true, and how to use it. They'll also learn what the converse of the isosceles triangle theorem is, and why it's true. Here's a proof of the converse. Conclude by giving your students the challenges found here and here, in any order, they're both pretty easy.
Conclude by giving your students these challenges:
- Fence It by NRICH
- Escape from the Castle by NRICH
- Isosceles Triangles by NRICH
- Target Score by Pierce School: Problem / Solution