If the difference between the circumference and diameter of a circle is $30$ cm then what is the radius of the circle?

14 c m

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3.5 c m

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7 c m

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6 c m

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Solution

The correct option is C $7 c m$
Let radius of the circle be 'r' cm. then,
$2 π r - 2 r = 30 2 r (π - 1) = 30 r (\frac{22}{7} - 1) = 15 r \times \frac{15}{7} = 15 r = 7 c m$

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