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23-02-2017
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There is a figure made up of 4 identical semicircles. The radius of each circle is 10. Find the area of this figure.(Show your work)

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23-02-2017

area of circle=pir^2
4 of them, but wait, semicircles are half circles
1/2 circle times 4=2 circles

so
r=10

2pir^2
2pi10^2
2pi100
200pi square units
about 628.31 square units

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