A 34-foot ladder is leaning against a building. The base of the ladder is
16 feet from the side of the building. How high does the ladder reach along the side of the building?
Typical 8-15-17 Pythagorean Triple, TIMES 2.
8(2)-15(2)-17(2) = 16-30-34. You should see that the missing side is 30 feet.