Question

The length of a roller is 40 cm and its 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 metres square

Answer 1

area of rollar is h×2pie r
=40×2×22/7×21/2
=40×22×3
=2640cm^2
area of floor= area of roller and times he moves=2640×300cm
=792000cm^2
= 7920m^2

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Answer 2

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