find the area of a circle whose circumference is 8 pie
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we know that
c=2πr
8π=2πr
then we cancel pie of 8 by pie of 2
then we have
r=4
and the formula of area of circle
a=πr×r
a=4 ×4π
a=16π
c=2πr
8π=2πr
then we cancel pie of 8 by pie of 2
then we have
r=4
and the formula of area of circle
a=πr×r
a=4 ×4π
a=16π
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