# Triangle Sum Proof (using transversals)

- Author:
- Jay Lietzow

- Topic:
- Geometry

Use this dynamic activity to explore how you can prove that a the sum of the interior angles of a triangle is 180 degrees, using transversals of parallel lines.

- Author:
- Jay Lietzow

- Topic:
- Geometry

Use this dynamic activity to explore how you can prove that a the sum of the interior angles of a triangle is 180 degrees, using transversals of parallel lines.