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Question

Find the circumference of the circle with a radius of 21cm by taking π=227.


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Solution

Find the circumference of the circle

Given that the radius of the circle is 21cm

We know that if r is the radius of the circle and C the circumference of a circle then

Circumference of the circle C=2πr

r=21cm

C=2πrC=2×227×21C=2×22×3C=132

Hence, the circumference of the circle is 132cm.


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