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OpenStudy (anonymous):
If AB, across the window, measures 18 inches, calculate the area of semicircle arc ABC in square inches a. 9pi b. 18pi c. 40.5pi d. 162pi
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OpenStudy (anonymous):
OpenStudy (anonymous):
hang on...
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
C
OpenStudy (anonymous):
how do you know?
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OpenStudy (anonymous):
nevermind i got it! pi r^2/2 so 81pi/2
OpenStudy (anonymous):
yup
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