Solve for the length of the unknown side in the following right triangle. (Side AC is the hypotenuse.) Round your answer to two places, where applicable.

Question

Side AB Side BC Side AC

3
4
?

Answer 1

AC^2 = AB^2 + BC^2
AC^2 = 3^2 +4^2
AC = 9 + 16
AC^2 = 25
AC = sq(25)
= 5

Answer 2

And since it is a Pythagorean Triple we know it is a 3,4, 5 triangle : )