SOLUTION: An irrigation system waters in circular patterns. Each irrigated section is a circle with a diameter of 40 feet. In terms of π, what's the area of an irrigated section? a. 20

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Question 1019356: An irrigation system waters in circular patterns. Each irrigated section is a circle with a diameter of 40 feet. In terms of π, what's the area of an irrigated section?
a. 20 π feet square
b. 40 π feet square
c. 400 π feet square
d. 1,600 π feet square
Answer by ikleyn(52794) About Me  (Show Source):
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An irrigation system waters in circular patterns. Each irrigated section is a circle with a diameter of 40 feet. In terms of π, what's the area of an irrigated section?
a. 20 π feet square
b. 40 π feet square
c. 400 π feet square
d. 1,600 π feet square
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The area of the circle is pi%2A%28d%5E2%2F4%29%29, in terms of diameter.

So in your case it is pi%2A%2840%5E2%2F4%29 = pi%2A40%2A10 = 400pi feet square.

The answer is c.