The circumference of a circle is $123.2$ cm. Then the radius of the circle in cm is

28

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22

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19.6

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30

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Solution

The correct option is C $19.6$ cm
$G i v e n - T h e c i r c u m f e r e n c e o f a c i r c l e = 123.2 c m . T o f i n d o u t - t h e r a d i u s o f t h e s a m e c i r c l e = ? S o l u t i o n - L e t C b e t h e c i r c u m f e r e n c e o f t h e c i r c l e a n d r b e t h e r a d i u s o f t h e s a m e c i r c l e . T h e n C = 2 π r ⟹ r = \frac{C}{2 π} = \frac{123.2 \times 7}{2 \times 22} c m = 19.6 c m . S o t h e r a d i u s o f t h e c i r c l e i s 19.6 c m . A n s - O p t i o n C .$

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