Question

length of minute hand of a clock in home is 7 cm the area swept by it in 30 minutes is ​

Answer 1

Given;

• r = 7 cm
• time = 30mins

we know that in ;

• 60mins = min hand rotates 360°
• 30mins = θ degrees

Thus by unitary method ;

• θ = 360×30/60
• θ = 360/2
• θ = 180°

Thus area swept = area of the sector :

• πr²× θ/360°
• 22/7 × 7 × 7 × 180/360
• 22/1 × 7 × 1/2
• 22/2 × 7
• 11 × 7
• 77 cm²

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