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The diameter of a circular ring is 6.28 ...

The diameter of a circular ring is 6.28 cm. What is its circumference, taking into account the significant figures?

A

19.72 cm

B

19.7 cm

C

19.73 cm

D

19.8 cm

Text Solution

Verified by Experts

The correct Answer is:
B
`R=(6.28)/(2)=3.14cm`
`therefore` Circumference `=2piR=2xx3.14xx3.14=19.72cm`
But there are 3 significant figures, in the measurement of radius.
`therefore` Circumference = 19.7 cm.
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