A 13ft ladder leans against the side of a house. The bottom of the ladder is 10ft from the side of the house. How high is the top of the ladder from the ground? If necessary, round your answer to the nearest tenth.

We have a right triangle. Hypotenuse = 13, one leg = 10.

We use our Pythagorean theorem Calculator to solve for the other leg:
s = 8.3066