plz. answer fast,
the length of a rollar is 40 cm and its diameter is 21 cm. it takes 300 complete revolution to move over to level the floor of a room . find the area of the room in meter sq.
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Answer: length=40cm
Diameter=21cm
Radius=21÷2=10.5cm
C.S.A=2πrh
=2×22÷7×10.5×40
=2640cm^2
Area of room in cm^2=2640×300
=792000cm^2
Area of room in m^2 =792000÷10000
=79.2m^2
Step-by-step explanation:
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