find the radius and the area of a circle if it's circumference is 18 pie cm
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radius=9cm. and area=254.57 square cm.
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Circumference of circle=18 pie
2×pie ×radius=18pie
r=18 pie/2pie
r=9
hence,radius=9cm
2×pie ×radius=18pie
r=18 pie/2pie
r=9
hence,radius=9cm
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