Question

The length of the minute hand of a clock is 3.5cm. Find the area swept by minute hand in 30 minutes​

Answer 1

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In 30 minutes, Minutes hand would cover 180° of angle! So it's sweeps half of area of circle! So!

Area swept = (0.5) (π) (35)²

After full calculation you would get answer as 1925 cm

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Answer 2

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The length of the minute hand of a clock is 3.5cm. Find the area swept by minute hand in 30 minutes

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Angle subtended by the minutes hand in 30 min (x°) = 180°

Length of the minute's hand (r) = 3.5cm

Area swept by minutes hand in 30 min

= area of the sector

= x°/360° × πr²

= 180/360 × 22/7 × (3.5)²

= 19.25 cm²

The area swept by minute hand in 30 minutes is 19.25 cm²