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1 - r/7
Another way to write the same thing is 7/7-r/7 which is
(7-r)/7
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\ r-7 `-. ._ ' . ` \
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-9
area = pi*r*r
r = diameter/2
r=7
7*7 = 49
49pi, or
153.9380400258998686846695257807 sq in
22/7*D (or) 22/7*R*R