Mathematics
orlacarlin
4

An industrial rolling machine is made up of three identical cylinders of radius 9 cm. The ends of the rollers are surrounded by a strip of metal. Find the length of the metal strip, giving your answer correct to 1 decimal place.

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(2) Answers
Llama11

The radius of the cylinder is = 9 The ends of the rollers are surrounded by metal strip. The metal strip goes round the circle. That is the circumference of the circle. C = 2πr  = 2π*9 = 18π cm. Length of metal sheet on one of the circle = 18π cm. For the 3 rollers = 18π *3 = 54π cm.  Using π ≈ 3.14 Length = 54π ≈ 54*3.14 ≈ 169.56 cm Therefore length for the 3 metal strips = 54π ≈ 169.56 cm

MelindaBalkin

54π ≈ 169.56 cm  I hope I helped :)

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