Read the following SAT test question and then click on a button to select your answer.

Sarah has a rectangular swimming pool that measures 12 feet(ft) by 72(ft) across the surface. To the nearest foot, what is the diagonal distance across the surface of the pool?

A.60ft
B.71ft
C.73ft
D.84ft

来源:可可英语 http://www.kekenet.com/sat/201611/476506.shtml