Math and Arithmetic

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# A cylinder 90 cm high has a circumference of 20 cm A string makes exactly 6 complete turns round the cylinder while its two ends touch the cylinder's top and bottom how long is the string in cm?

###### Wiki User

###### 2008-12-27 12:37:01

For the string to wrap around the cylinder and yet do so by

"coiling" around the outside of the cylinder from bottom to top, it

will need to be **150cm** long.