conical pillar has base diameter 28cm and height 48cm
50 of these were constructed
find cost of painting them at the rate of rs. 120 per m^2
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r=14cm
h=48cm
l=√(r) 2+(h)2
=√(14)2+(48)2
=√196+2304
=√2500
l=50
curved surface are of cone =πrl
= 22/7x14x50
=22x2x50
=2200
curved surface area of 1 = 2200
curved surface are of 50= 2200x50
=110000cm2=1100m2
cost of painting per metre= Rs 120
cost of painting 1100m2= 120x1100
=132000
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