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# Form 1 Physics Measurement 1 Video Questions and Answers

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

(2m 17s)
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=550/25=22cm or 0.22m
Circumference = 2pir
0.22=2×22/7× r
7/44×0.22=cancel44/cancel7× r×cancel7/cancel44