Surface Area of a Sphere, Curved surface Area of a Hemisphere, Total Surface Area of a Hemisphere
The diameter of the moon is approximately one-fourth of the diameter of the earth. Find the ratio of their surface area.
The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
A hemispherical bowl made of brass has inner diameter 10.5 cm. Find the cost of tin- plating
it on the inside at the rate of Rs. 4 per 100 `cm^2`
A cylinder of same height and radius is placed on the top of a hemisphere. Find the curved
surface area of the shape if the length of the shape be 7 cm.