Question

20. Which one of the following is the area of a
sector of a circle of radius 10 cm formed by an
arc length of 15 cm?
(a) 10 cm? (b) 151 cm? (c) 75 cm? (d) 150 cm?
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Answer 1

Answer:

perimeter=2×3.14×10 cm=314/5 cm

now ....area=314cm^2

therefore area of the sector..

$\frac{314}{ \frac{314}{5} } \times 15 = 75 \: cm {}^{2}$