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Find the diameter of a circle whose circumference is 12.56 cm.

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3.99 cm

2.54 cm

5.66 cm

7.34 cm

answer is A.

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Detailed Solution

Given a circle whose circumference is 12.56 cm.
The circumference of the circle of radius r is,

C = 2 π r

⇒ 2 × π × r = 12.56 ⇒ 227 × 2 × r = 12.56 ⇒ D = 12.56 × 7 22 ⇒ D = 3.99 c m

Therefore, the diameter of the circle is 3.99 cm.
Hence, option 1 is correct.

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