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Question

The area of a circle is 394.24 cm2. Then the circumference of the circle is

A
116 cm.
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B
70.4cm.
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C
100cm.
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D
88cm.
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Solution

The correct option is D 70.4cm.

GiventheareaAofacircle=394.24cm2


TofindoutthecircumferenceCofthecircle=?


SolutionWeknowthatar.circle=A=πr2whenr=radiusofthecircle


r=Aπ=  394.24227cm=11.2cm.AgainthecircumferenceCofthecircle=2πr


C=2×227×11.2cm=70.4cm


AnsOptionB.


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