CBSE Class 9  Surface Area: Sphere and Hemisphere Videos
Surface Area: Sphere and Hemisphere
Surface Area: Sphere & Hemisphere
 find the radius of a sphere whose area is 154 cm

Can you please answer these all questions
 If a sphere and a hemisphere have the same surface area, find the ratio of their radii if r1 is the radius of the sphere and r2 is the radius of the hemisphere.
 The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas
 If the area of the top of a hemispherical bowl is 154 cm2. Its volume is 714.65 cm3(app.) 718.67 cm3 (app.) 716.92 cm3 (app.) 720.46 cm3 (app.)
 A hemispherical bowl is made of steel, 0.7 cm thick has inner radius 14 cm. It is to be polished from inside and outside. Calculate the total area to be polished.
 Two hemispherical bowls are formed by cutting a spherical ball of diameter 28 cm from the centre. Calculate the total surface area of each of the hemispherical bowls so formed.
 A toy is in the form of a hemisphere surmounted by a cone of radius 3 cm and height 4 cm. Calculate the surface area of the toy.
 If the circumference of the base, a hemispherical dome of a building is 352 cm, find the lateral surface area of the dome.
 The hollow sphere, in which the circus motorcyclist performs his stunts, has a radius of 2.8 m. find the area available to the motorcyclist for riding.