The length of a minute hand of a wall-clock is 10.5 cm. Find the distance covered
by tip of minute hand in 2 hours.
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The angle for 1min = 360°/60min = 6°
for 7min = 6° × 7 = 42°
0 = 43° , r = 10.5 = 105/10 ,
ar of sector
= 0/360 πr²
= 42/360 × 22/7 × 105/10 × 105/10
= 11×105×105/90×10×10
= 121275/9000
ar of sector
= 13.475 cm²
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