Aug 29, 2020 · Now Surface area of a Sphere = 4 π r 2 = 4 x (22/7) x 7 x 7 = 616 mm 2. Volume of a sphere = = (4312/3 ) mm 3. Example-2: A shot-put is a metallic sphere of radius 2.1 cm and density of the metal used for same is 7.8 gm/cm 3. Find the weight of the shot-put. Solution: The shot-put is a solid sphere with the radius 2.1 cm
The surface area of a pyramid or cone is the lateral area plus the area of the single base. The surface area of a sphere is equal to 4 r 2. Analogous to the unit circle is the unit sphere. Similarly, just as there are 2 radians of angle in one revolution, there are 4 steradians of solid angle in all directions.