# Thread: I understand Pythagorean Theorem ok, but can't figure this out

1. ## I understand Pythagorean Theorem ok, but can't figure this out

The first picture shows the answers. I don't understand how they calculated "O" to be 39. I can't see how the given 63 and 24 lengths would give you the missing length of "O". I understand the formulas, but I must be missing something else.

2. ## Re: I understand Pythagorean Theorem ok, but can't figure this out

They cheated by making the angle between TR and the 63" piece 45 degrees without really labelling it.

This means that $O+24=63,~O=39$