A lawnmower takes 750 complete revolutions to cut grass on a field. Calculate the area of the field if the diameter of the lawnmower is 84 cm and length is 1 m.
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Answer:
Area of road =750× area covered in 1 revoluation
=750× lateral surface area of cylinder
=750×2πrh
Given, d=84cm⇒r=42cm→
100
42
m
h=1m
=750×2×
7
22
×
100
42
×1
=
100
1500×132
=1980m
2
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