The Pythagorean Theorem says for a right triangle with legs a,b and hypotenuse c,
Solving for each in turn,
Looking at our choices, we select the third and fourth.
The pythagorean theorem states that, in every right triangle, the following formula holds:
where a and b are the legs, and c is the hypotenuse.
We can deduce the following expressions for a,b and c: