The length of a roller is 40cm and its diameter is 21cm it takes 300 complete revolutions to move once over to the floor of a room find the area of the room in m^2
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Since the roller's wheel is int the form of a cylinder...
radius = diameter /2 = 21/2cm
length = 40cm
C.S.A of a cylinder = 2πrh
C.S.A = 2×22/7×21/7×40
C.S.A = 44×3×40/7
C.S.A = 754.28cm²
Since it takes 300 complete revolutions to move once over a room...
So the area of the room = 754.28 × 300 ( since it takes 754.28cm² of area to complete a revolution for 300 revolutions we multiply it by 300)
Area of room = 754.28 × 300
Area = 226284cm² or 22.6284 m²
radius = diameter /2 = 21/2cm
length = 40cm
C.S.A of a cylinder = 2πrh
C.S.A = 2×22/7×21/7×40
C.S.A = 44×3×40/7
C.S.A = 754.28cm²
Since it takes 300 complete revolutions to move once over a room...
So the area of the room = 754.28 × 300 ( since it takes 754.28cm² of area to complete a revolution for 300 revolutions we multiply it by 300)
Area of room = 754.28 × 300
Area = 226284cm² or 22.6284 m²
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