Question

If AC = 15 centimeters, and BC = 12 centimeters, which does AB equal

Answer 1

The pythagorean theorem says that a² + b² = c²

You're given the b and the c so substitute the values in: a² + 12² = 15²

a² + 144 = 225; subtract 144 from both sides

a² = 81; square root each side

a = 9, or choice C