Instruction

1

Given the scope and the known area of its surface. Then, using the formula to calculate the surface area

R = v(4•P/S), where S is the surface area

**of the sphere**, we can calculate its radius:R = v(4•P/S), where S is the surface area

**of the sphere**, P = 3,14.

2

If you know the volume of a sphere, which limits the sphere, the radius can be found by the formula:

R = (3•V/4•N)^1/3, where V is the volume of a sphere, P = 3,14.

R = (3•V/4•N)^1/3, where V is the volume of a sphere, P = 3,14.

Useful advice

In cases where the area of the inscribed or circumscribed about a regular polyhedron, you can use the following formulas.

For a sphere inscribed in a regular tetrahedron R = √6/12•a, where a is the edge length of a tetrahedron

For the sphere, described about a regular tetrahedron R = √6/4•a, where a is the edge length of a tetrahedron

For a sphere inscribed in a cube R = 1/2•a, where a is the edge length of the cube

For the sphere described about Cuba R = √3/2•a, where a is the edge length of the cube.

For a sphere inscribed in a regular tetrahedron R = √6/12•a, where a is the edge length of a tetrahedron

For the sphere, described about a regular tetrahedron R = √6/4•a, where a is the edge length of a tetrahedron

For a sphere inscribed in a cube R = 1/2•a, where a is the edge length of the cube

For the sphere described about Cuba R = √3/2•a, where a is the edge length of the cube.