the radius and height of closed cylindrical cistern are 50 cm and 90 cm respectively. find the cost of painting its total external surface at the rate if 4 per 100 cm square
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Answer:
Step-by-step explanation:
TSA of cylinder = 2πr^2 + 2πrh
= 2*22/7*50*50 + 2*22/7*90
= 110000/7 + 3960/7
= 113960/7
= 16280 cm^2
Cost of painting rate rs. 4 per 100 cm^2
= 16280/100*4
= Rs. 651.2
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