Do you know what is the formula used for finding **diagonal of a cube**. If you don’t know, now learn and know the **diagonal of a cube formula**. This is the one of the important formulas in mensuration that we should learn definitely.

Before learning the formula, we just revise what is a cube? The 3D shape of a square is called as a cube. All the sides of a cube will be equal in dimensions. Now directly we will discuss and learn the formula for **finding the diagonal of a cube**.

**Formula for diagonal of a cube:**

Let “S” be the side of a cube. Then diagonal of a cube can be find out by the formula

Diagonal, D = √3 × S.

Example:

If 6 cm is the side of a cube then its diagonal will be √3 × 6 = 1.732 × 6 = 10.392 cm.

For a cube, if the side is 15 m then the diagonal of that cube is = √3 × 15 = 1.732 × 15 = 25.98 m.

Hope you have understood **diagonal of a cube formula**.

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