# Shearer Action 3!

- Author:
- Tim Brzezinski

- Topic:
- Geometry, Right Triangles, Square

Creation of this resource was inspired by this tweet from Catriona Shearer.
You can move the

**LARGE WHITE VERTICES**of the**right triangle**anywhere you'd like at any time.**Key Questions:**1)**What is the measure of the pink angle?**2) How can we formally prove your response to (1) is ALWAYS TRUE (regardless of the location the**right triangle's**3 vertices)?