the length of roller is 40 cm and it's diameter is 21 cm. it takes 300 complete revolution to move once over to level the floor of a room. find the area of the room in m ^2
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Length of the roller=40cm
Diameter=21cm
Radius=21/2cm
C.S.A of roller=2πrh
=2×22/7×21/2×40
=2640cm^2
=2640/(100×100)m^2
=0.264m^2
C.S.A of the roller=1 revolution
Area of floor of room=no. of revolution×C.S.A. of roller
=300×0.264
=792m^2
So, the area of floor of room=792m^2
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