The length of a roller is 40cm and its diameter is 21cm. it takes 300 complete revolution to move once over to level the floor of a room. find the area of the room in m2
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radius =10.5cm
circumference=2*22/7*10.5=2*22*1.5=66cm
area =l*b=66*40=2640cm2=02640m2
circumference=2*22/7*10.5=2*22*1.5=66cm
area =l*b=66*40=2640cm2=02640m2
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