Question

are cylindrical roller is used to paint a rectangular does the length of the roller is 1.4 M and its diameter is 0.7 M is the roller rules 50 times to cover the dice completely find the area of the dice

Answer 1

Diameter = 1.4 m
r = d/2
r = 1.4/2
r = 0.7m
curved  surface area of cyclinder = 2 * 22/7 * r^2                                                                                                    = 2 * 22/7 * 0.7 * 0.7                                                 = 8.8 m^2
                           No of revolution = 5
Therefore  = 8.8 * 5                   = 44 m2

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