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The length of minute hand of a wall clock is 7 cms. The area swept by minute hand in 30 minutes is?

147 sq. cm
210 sq. cm
154 sq. cm
77 sq. cm

Correct Answer: 77 sq. cm

Explanation:

Angle swept in 30 min= 180°
Area swept = [(22/7) x 7 x 7] x [180°/360°] cm²
= 77 cm²

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