Find the area swept by a minute hand of a clock in 5 minutes which is 7 cm in length.
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Answer:
For a minute hand, 60 minutes is equivalent to 360
0
and so 30 minutes will be 180
0
.
Area swept in 60 minutes is area of full circle.
So area swept in 30 minutes will be area of
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area of sector = teeta/360° × πr2
wkt, in 1 hr (60 mins) , the minute hand rotates 360° .
==> in 5 minutes, 360 /60× 5 = 30°
r= 7cm ( given)
Area = 30° / 360° × 22/7 × 7× 7
= 1 / 12 × 22 × 7
= 1/6 × 77
= 77/6 cm2
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