SOLUTION: how many square feet of concrete surface are there in a circular walkway 8ft wide surrounding a tree if the tree has a diameter of 3ft.

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Question 1122452: how many square feet of concrete surface are there in a circular walkway 8ft wide surrounding a tree if the tree has a diameter of 3ft.
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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The area is the area of the larger circle minus the area of the smaller circle


pi%2A%281.5%2B8%29%5E2 - pi%2A1.5%5E2 = 88%2Api = 88%2A3.14 square feet.


Use your calculator.