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A length 550cm of thin thread wraps around a cylinder exactly 25 times. Calculate the circumference and the radius of the cylinder (Take π=22/7)

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Circumference =550/25 =22cm
Circum = πD or 2πr
2πr=22
2×22/7×r=22
r=22×7/22 x 1/2
R = 3.5cm

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