Diameter is a line which connects two points of a curvilinear figure and at the same time passes through its center. Often it is required to find diameter of a circle or sphere in applied tasks. Diameter of a circle can be found on its radius, length and the area of a circle. Diameter of a sphere is found on the radius, volume and surface area.
Instruction
1. Diameter of a circle or sphere if their radiuses are known, can be found, knowing that diameter in two time exceeds radius. Thus, for finding of diameter on radius, it is necessary to increase the size of radius by two: D = 2*R where R is figure radius.
2. Diameter of a circle if its length is known, can be found on a formula: D = L/pi, where L – circle length, p – the constant approximately equal 3.14.
3. Diameter of a circle if its area is known, can be found on a formula: D = 2 * (S/p) ^1/2 where S is the area of a circle.
4. Diameter of a sphere if its volume is known, can be found using a formula: D = (6V/p) ^1/3, where V – sphere volume.
5. If sphere surface area is known, then its diameter can be determined on a formula: D = (S/p) ^1/2 where S is sphere surface area.