Question

The minute hand of a clock is 15cmlong calculate the area and swept by it in 20min

Answer 1

As the angle between the every 5min in a clock is 30°

so, in 20min the angle will be 4×30=120°

as, 120° is 1/3 of 360° ( that is the whole swept ) ---------1

as we know that, area of clock with radius 15cm

is given by,
2π(r)^2

2×22/7×225. (15^2= 225)

1415cm square
now, from eq. 1 we get,

1/3 of 1415=1/3×1415

=471.6cm square

HOPE YOU UNDERSTAND IT...

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