radius of a sphere is 70mm.find the cost of painting the curved surface @ rs 0.02 percm
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Step-by-step explanation:
CSA OF SPHERE = 4/3πR^3
= 4/3×22/7×7×7×7
=4/3×22×14
=4312/3 cm^2
RATE OF COST
1cm ^2=Rs.0.02
4312/3 cm^2=0.02×4312/3
=0.02× 1437.33
=28.74666
cost of painting =Rs.28.75(approx)
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