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From a circular sheet of radius $70$ cm, a quadrant is cut. Find the area of the remaining sheet.
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Solution : Area of remaining sheet $= \pi r^2 - \frac{1}{4} \pi r^2 = \frac{3}{4} \pi r^2$
$= \frac{3}{4} \times \frac{22}{7} \times 70 \times 70 = 11550$ sq. cm
$= \frac{3}{4} \times \frac{22}{7} \times 70 \times 70 = 11550$ sq. cm