Homework Help: math

Posted by Thano on Monday, March 10, 2008 at 8:52am.

Now imagine a circle with a 3-mile radius to be a hypothetical metropolitan area with relatively little undeveloped land inside. If the radius of this hypothetical metropolitan area is extended to 10 miles, how much land is added to the original developed area? (Note: Use 3.1416 as the value of ð in your formula for the area of your circle. There are 640 acres in a square mile.)

math - Reiny, Monday, March 10, 2008 at 10:38am
The original area with a 3 mile radius was 9pi square miles
The new area with a 10 mile radius is 100pi square miles
So the new area added is 91pi square miles or
91*3.1416*640
= 182,967 acres

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