The perimeter of a sector of a circle of radius 21 cm is 75 cm. Find the area of the sector.

CBSE Class 10 Maths PYQ · Areas Related to Circles · Sector Area · 2 Marks · March 2025 · Standard

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382 Marks · March 2025 · Standard
The perimeter of a sector of a circle of radius $21$ cm is $75$ cm. Find the area of the sector.
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(b) $\frac{\theta}{360} \times 2 \times \frac{22}{7} \times 21 + 42 = 75 \implies \frac{\theta}{360} = \frac{1}{4}$
Area of sector = $\frac{1}{4} \times \frac{22}{7} \times 21 \times 21 = \frac{693}{2}$ or $346.5$ cm$^2$
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