Question

In a toy factory,200 wooden closed cylinders of diameter 35 mm and height 7 cm have to be painted.what is the total surface area ,in cm square,that needs to be painted?

Answer 1

Answer:

TSA of cylinder = 2πr(r+h)

r = d/2 = 3.5/2 = 1.25 cm

h = 7 cm

TSA = 2 × 22/7 × 1.25 (1.25+7) = 64.8 sq.cm (approx.)

There are 200 toys, so 64.8 × 200 = 12,960 sq.cm

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