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In a toy factory,200 wooden closed cylinders of diameter 35mm and height 7cm have to be painted. What is the total surface area, in cm,that needs to be painted (take pi to be 3.14)

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Diameter of the cylinder = 35 mm = 3.5 cm  => r = 1.75 cm

Height (h) = 7cm 

Total Surface area of the one cylinder = 2πr( h +r )

                                                    = 2x3.14x1.75(7 + 1.75 ) 

                                                    = 96.162 cm2

Total area of 200 cylinders which need to be painted = 200x96.162

                                                                                    = 19232.5 square cm.

Posted by

Ravindra Pindel

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