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Length of Arc of a Sector

Find the leng...

Question

Find the length of an are of circle which subtends an angle of $180^{0}$ at the centre, if the radius of the circle is $15$ cms.

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Solution

We have,
$l = r θ$
$= 15 \times \frac{π}{2}$
$= \frac{15 π}{2} c m$ .

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