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A rectangular sheet of paper 40cm*22cm …

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A rectangular sheet of paper 40cm*22cm is rolled to form a hollow cylinder of height 40cm.Find the radius of the cylinder.

Posted by K Gangayya Reddy 6 years ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years ago

H = 40 cm
when the sheet is rolled 22 cm becomes the circumference of the base circles.
circumference = 22 cm
2 π r = 22 cm
2×22/7×r = 22 cm
r = 22×1/2×7/22
r = 7/2
r = 3.5
Hence the radius as 3.5 cm

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