SOLUTION: Find the area of the semicircle with a radius of 9

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Question 1141928: Find the area of the semicircle with a radius of 9
Answer by math_helper(2461) About Me  (Show Source):
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Area of a circle: +A+=+pi%2Ar%5E2+
Area of a semicircle is 1/2 of the area of a full circle:
+A%5Bsemi%5D+=+%281%2F2%29pi%2Ar%5E2+
Just plug in r=9 to find +A%5Bsemi%5D+