a piece of string is wound tightly round a cylinder for 20 complete turns.the length of the string is found to be 3.96m. Calculate the diameter of the cylinder In cm

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14-03-2021
Mathematics

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a piece of string is wound tightly round a cylinder for 20 complete turns.the length of the string is found to be 3.96m. Calculate the diameter of the cylinder In cm

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h4M63Rger h4M63Rger · Answer 1 · 2021-03-14T20:18:29+01:00

h4M63Rger h4M63Rger

14-03-2021

3.96m = 396 cm (because 1m = 100cm)

Now divide 396cm by 20

396/20= 19.8 cm (this is the circumference of the cylinder)

C=2πr

19.8 =2πr

19.8/2π=r (divide 19.8 *circumference with 2π)

r= 3.15cm ( correct to two dp)

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a piece of string is wound tightly round a cylinder for 20 complete turns.the length of the string is found to be 3.96m. Calculate the diameter of the cylinder In cm​

Respuesta :

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a piece of string is wound tightly round a cylinder for 20 complete turns.the length of the string is found to be 3.96m. Calculate the diameter of the cylinder In cm