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What is the formula for a half circle?
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What is the formula for a half circle?

User ProbablyCorey
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A semi-circle is half of a circle and the area of a circle of radius r is r2. We know that the radius is 9ft. Pi is approximately 3.14 or 22/7. Now you just have to plug in the numbers and you will find the area! cx
User Anconia
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