Lance is swimming at the country club swimming pool the pool is 30 feet wide and 100 feet long if lance swims the diagonal length of the pool how far will he swim?

The idea here is to use the Rule of Pythagoras, a2 + b2 = c2, or c = square root of (a2 + b2). "c" in this case is the diagonal. (The rule applies when a and b are at right angles; I am assuming here that the swimming pool is rectangular, which is usually the case.)