The geometric locus of points that are the same distance from a point called the centre of the sphere.
A sphere may be obtained by rotating a circle about its diameter.
- In the illustration below, the axis z contains a diameter of the circle.
- A sphere does not have a net.
- The diameter of a sphere is the line segment that joins two points of a sphere and that passes through the centre of the sphere.
- A great circle is the intersection of a sphere and a plane passing through the centre of a sphere.
- A small circle is a section of a sphere formed by the intersection of a sphere and a plane that does not pass through the centre of the sphere.
Formulas
- The area A of a sphere of radius r is : A=4πr2
- The volume V of a sphere of radius r is : V=4πr33
- The area of a sphere is equal to 23 of the total area of its circumscribed cylinder.
- The area of a sphere is equal to 49 of the total area of its circumscribed right circular cone.
- The volume of the space bounded by a sphere is equal to 23 of the volume of its circumscribed cylinder.
- The volume of the space bounded by a sphere is equal to 49 of the volume of its circumscribed right circular cone.