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Area of a Circle

The differenc...

Question

The difference between circumference and diameter of a circle is $135 c m .$ Find the radius of the circle. $[Take π = \frac{22}{7}]$

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Solution

Let the radius be $r$
Circumference of circle is $2 π r$
Difference between circumference and diameter of a circle is $135$
$⟹ 2 π r - 2 r = 135 ⟹ 2 r (\frac{22}{7} - 1) = 135 ⟹ r = 31.5 c m$

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