The circumference of circle exceeds the diameter by 21cm. Find the area of the circle
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2pi × r - 2r : 21 cm
2pi×r : 21 + 2r
r : 21 + 2r / 2pi
area : pi × r^2
area : pi × ( 21 + 2r / 2pi )^2
2pi×r : 21 + 2r
r : 21 + 2r / 2pi
area : pi × r^2
area : pi × ( 21 + 2r / 2pi )^2
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