How many times will the wheel of a cycle rotate to cover a distance of 12.1 km if it's diameter is 77 cm?
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D = 77 cm
r = 77/2 cm
circference = distance covered in 1 rotation = 2πr = 2×22/7×77/2 = 242 cm
242cm = 1 rotation
242000 cm = 1000 rotations
Ans ) 1000 rotations
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