Question

A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the
cost of Rs 498.96. If the cost of white-washing is Rs 2.00 per square metre, find the (i) inside
surface area of the dome, (ii) volume of the air inside the dome.
On​

Answer 1

Answer:

surface area of dome=498.96/2.00

=249.48cm^2

surfae area of hemisphere =3πr^2

249.48=3*22/7*r^2

249.48*7/3*22=r^2

3.78=r^2

1.9=r

volume of hemisphere =2/3πr^3

=2/3*22/7*1.9*1.9*1.9

=14.37 cm^3