find the radius and the area of a circle if it's circumference is 18 pie cm
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circumference of circle =2πr
18π=2rπ
18=2r
r=18/2
r=9CM
area of circle is πr^2
π×(9)^2
π×81
81πcm^2
18π=2rπ
18=2r
r=18/2
r=9CM
area of circle is πr^2
π×(9)^2
π×81
81πcm^2
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