# Pythagoras by Proportions

- Author:
- David Cox

- Topic:
- Ratios

Move points A and B to change Triangle 1. The other triangles will adjust accordingly.

1. What proportions can you write to compare Triangles 2 and 3 to Triangle 1?
2. Solve your proportions for x (or y).
3. How can you use the fact that x + y = c to demonstrate the Pythagorean Theorem?