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) 107 cm² (b) 151 cm² (c) 75 cm² (d) 150 cm?
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Angle, ∅= arc/radius= 15/10=3/2
area of sector= 1/2 x r² x∅
= 1/2 x 100 x 3/2
=75 cm²
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