Question 1019356
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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*(d^2/4))}}}, in terms of diameter.


So in your case it is {{{pi*(40^2/4)}}} = {{{pi*40*10}}} = {{{400pi}}} feet square.


The answer is c.