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Find the diameter of a circle whose circumference is 11.0 km.

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3.2 km

3.5 km

6.3 km

4.5 km

answer is B.

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Detailed Solution

Given a circle whose circumference is 11.0 km.
Circumference of the circle is,

C = π d

⇒ π d = 11

By substituting circumference in the formula to get diameter,

⇒ 227 × d = 11

⇒ d = 11 × 7 22

⇒ d = 72

⇒ d = 3.5 k m

Therefore, diameter of the circle is 3.5 km.
Hence, option 2 is correct.

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