# What is the formula of diagonal of cube and cuboid?

A diagonal is a line segment that joins two vertices of a polygon or a polyhedron.

## Answer: Diagonal of a cube = 3⎷a , Diagonal of a cuboid = ⎷(l^{2} + b^{2} + h^{2})

Let us see the formula for the diagonal of a cube and a cuboid in the following section.

**Explanation:**

Let 'a' be the side length of a cube.

The formula for the diagonal of a cube is = 3⎷a

Let 'l' be the length, 'b' be the breadth and 'h' be the height of a cuboid.

The formula for the diagonal of a cuboid is = ⎷(l^{2} + b^{2} + h^{2})

### Thus, the diagonal of a cube = 3⎷a , diagonal of a cuboid = ⎷(l^{2} + b^{2} + h^{2})

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