a dome of a building is in the form of a hemisphere . from inside it was whitewashed at the cost of 1540 . if the cost of whitewashing is 5 per square metre , find the inside surface area and the volume of the air inside it
Simran2003:
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cost of white washing from inside /cost of white wash per sqm=1540/5=308msq.
Therefore Inside surface area =2πrSquare
308=2×22/7×r ^{2}
therefore r=7
volume of hemisphere=2/3πr^3
=2/3×22/7×7×7×7
=2156/3
=718.66msq
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