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OpenStudy (anonymous):
please help! question attached in comments.
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OpenStudy (anonymous):
OpenStudy (xmissalycatx):
Do you know how to find the area of the semi-circle?
OpenStudy (anonymous):
pi times r^2 all over 2?
OpenStudy (xmissalycatx):
Yes good job. Okay, so the radius is going to be 9 mm so use that in your formula and find the area..
OpenStudy (anonymous):
81pi/2?
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OpenStudy (anonymous):
i got 127.17
OpenStudy (xmissalycatx):
That's correct. Now we know that the radius is just half of the diameter, so 9 + 9 = 18 right? So the length of the rectangle will be 18. Do: 18 (9) = __?__ for your area and then subtract 127.17 from it.
OpenStudy (anonymous):
the answer i got is 34.83
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