It is a solid that has only one plane and each point of its plane is equally spaced from a fixed point. This point is called the center of the sphere and the distance of any point of the sphere from the center is called the radius of the sphere.
Volume of sphere=4/3πr³
The entire area of the sphere=4πr²
Volume of spherical spindle = 4/3 π (R³-r³)
When the radius of the sphere is k
(1), the curved surface area becomes k².
(2) Volume becomes k³ times.
If a plane is drawn from the center of the sphere, the sphere is divided into 2 equal half spheres, each sphere is called half sphere.
Volume of a semicircle = 2/3 πr³
Curve of hemisphere = 2πr²
The entire area of the hemisphere’s sphere = 3πr²