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  4. If l=14 π, r=45 mathrm~cm, and l=(x/360) × 2 π r, then find the value of x.

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Q. If $l=14 \pi, r=45 \mathrm{~cm}$, and $l=\frac{x}{360} \times 2 \pi r$, then find the value of $x$.

Squares and Square Roots and Cubes and Cube Roots

Solution:

$ l=14 \pi \text { and } r=45 \mathrm{~cm} $
$ l=\frac{x}{360} \times 2 \pi r $
$ 14 \pi=\frac{x}{360} \times 2 \times \pi \times 45$
$ x=\frac{14 \times 360}{2 \times 45} $
$\therefore x=56$