The difference between the circumference and the diameter of a circle is 15cm. The radius (in cm) of the circle is (take 22/7)
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2πr-2r=15
hence 2r(π-1)=15
2r(15/7)=15
r=3.5
hence 2r(π-1)=15
2r(15/7)=15
r=3.5
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