Approximately how many cubic feet of water are needed to fill a circular swimming pool that is 100 feet across and 4 feet deep?	Select the correct option
A) 15000 B) 30000 C) 50000 D) 70000 E) 90000
Answer Should be B.   V= \pir^2h= \pi*50^2*4= approximately 30000
<result>B</result>
Approximately how many cubic feet of water are needed to fill a circular swimming pool that is 100 feet across and 4 feet deep?