please. answer question no. 18
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first we need to find the radius of the hemisphere which can be done by calculating the surface area of the hemisphere by the given values.
cost for white washing 1m^2 is 400p
total cost=997.92 rupee
there s.a=99792/400=249.48 m^2
s.a of hemishere (not considering the base)=2pi r^2
therefore
249.48=2 ×22/7×r^2
from here we get r=6.3028
so volume of air =2/3pi r^3
=1179.2923 m^3
cost for white washing 1m^2 is 400p
total cost=997.92 rupee
there s.a=99792/400=249.48 m^2
s.a of hemishere (not considering the base)=2pi r^2
therefore
249.48=2 ×22/7×r^2
from here we get r=6.3028
so volume of air =2/3pi r^3
=1179.2923 m^3
yrd:
thanks
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