the lenght of a minute hand of a wall clock is 7cm.How much area does it sweep in 20 minutes?

  • 0

In 60 min, the minute hand sweeps 360 degrees.

Hence in 20 min, the minute hand sweeps 20*360/60 = 120 degrees.

The area swept will be the area of the sector formed by the minute hand.

Therefore, Area swept = Area of sector

= theta / 360 * pi radius2

= 120 / 360 * 22/7 * 72

= 154 / 3

= 51.33 cm2

Hope dis helps n plz thumbs up!!

  • 9

area swept will be-

=120/360*22/7*(7)2

=3*154

=462 cm2

  • 1

Minute hand takes 60 minutes to complete one circle, and in 20 minutes it will cover 20/60 or 1/3 area of the circle.

Therefore area swept = (1/3)*(22/7)*(7^2) = 154/3 = 51.33 cm2

  • -2
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