A circle has a radius of 10 feet and a central angle AOB that measures 180 degrees. What is the area of sector AOB? Use. 3.14 for pi and round your answer to the nearest whole number.

A. 16 ft^2

B. 31 ft^2

C. 157 ft^2

D. 314 ft^2

s=10*3.14

=31.4 ~31

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