Instruction
1
The diameter of a circle or sphere, if their radii can be found, knowing that the diameter is two times the radius. Thus, for finding the diameter and radius, have radius multiplied by two:
D = 2*R, where R is the radius of the shape.
2
The diameter of a circle if you know its length can be found by the formula:
D = L/PI where L is the circumference, PI is a constant approximately equal to 3.14.
3
The diameter of a circle if you know its area, you can find the formula:
D = 2*(S/PI)^1/2, where S is the area of a circle.
4
The diameter of the ball, if known, its volume can be find using the formula:
D = (6V/PI)^1/3, where V is the volume of a sphere.
5
If you know the surface area of a sphere, its diameter can be determined by the formula:
D = (S/PI)^1/2, where S is the surface area of a sphere.