The circumference of a circle is approximately equal to $157 u n i t s$ . Taking the value of $π = 3.14$ , what is the radius of the circle?

r = 10 u n i t s

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r = 15 u n i t s

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r = 20 u n i t s

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r = 25 u n i t s

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Solution

The correct option is D $r = 25 u n i t s$
$c i r c u m f e r e n c e = 2 π r$
$157 = 2 π r$
$\Rightarrow r = \frac{157}{2 π}$
$\Rightarrow r = \frac{157}{2 \times 3.14}$
or, $r = 25$ units

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