Mathematics
A hemispherical brass bowl has inner-diameter 10.5 cm. Find the cost of tin-plating it on the inside at the rate of ₹ 16 per 100 cm2.
Related Questions
Find the diameter of a sphere whose surface area is 154 cm2.
Find
(i) the curved surface area.
(ii) the total surface area of a hemisphere of radius 21 cm.
The radius of a spherical balloon increases from 7 cm to 14 cm as air is pumped into it. Find the ratio of the surface areas of the balloon in two cases.