Length of minute hand is 21cm area at 20 minutes
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There are 12 hours = 720 minutes in a clock.
So to cross one minute the minute hand takes 720/360 = 2 degrees.
Therefore 20 minutes = 40 degrees.
Area of sector = theta/360 × pi × r²
where theta is the angle of displacement of the minute hand and r is the radius = length of minute hand.
Therefore area = 40/360 × 22/7 × 21 × 21 = 22 × 7 = 154 cm².
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So to cross one minute the minute hand takes 720/360 = 2 degrees.
Therefore 20 minutes = 40 degrees.
Area of sector = theta/360 × pi × r²
where theta is the angle of displacement of the minute hand and r is the radius = length of minute hand.
Therefore area = 40/360 × 22/7 × 21 × 21 = 22 × 7 = 154 cm².
Feel free to message me if you have any doubts.
Please mark my answer as brainliest.
maheshwaranlupp0yaxy:
Here we take pi = 22/7.
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