1. Cornelius Metcalf “ Pythagorean Theorem and Distance Formula

3. The c is across the right angle

4. It is a right triangle

6. 20^2+x^2=90^2

7. 400+x^2=8100

8. -400 -400

9. x^2 90 20 x

11. First I subtract than I square than I add than I square root

13. 20 – 15 + 8 – 13

14. 5^2 -5^2

15. 25 -25

16. 0

17. 0