The length of the minute hand of a clock is 21 centimetre then the area swept by the minute hand in 20 minutes is
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angle formed by minute hand in 20 minutes= 120⁰
so area of sector is
(120⁰/360⁰)× (22/7)× 21² cm²
=(2×22×3×3×7×7)/(3×7)
= 2×22×3×7
=924cm²
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