**We will illustrate this with an example. **

Given an orthohedron as represented in the diagram.

The dimensions of the box are $6$, $8$ and $10$.

We are asked to calculate the dimensions of the diagonal of the lower base of the box.

We will look at the diagram and see that the base of the box is, in fact, a rectangle whose edges measure $6$ and $8$. These edges also serve as legs with a right angle between them.

Therefore, we will use the Pythagorean theorem and calculate the hypotenuse which, in fact, is the required diagonal.

**According to the** **Pythagorean theorem we will obtain:**

$X=10$

That is, the diagonal measures $10$.

**If you are interested in learning more about other triangle topics, you can go to one of the following articles:**

- The Pythagorean Theorem
- Acute Triangle
- Obtuse Triangle
- Scalene Triangle
- Equilateral Triangle
- Isosceles Triangle
- The edges of a triangle
- Area of a right triangle
- Height of a triangle
- How to calculate the perimeter of a triangle?
- Congruent triangles:
- Criterion of congruence: Side, Angle, Side
- Congruence Criterion: Angle, Side, Angle
- Congruence criterion: Side, Side, Side
- Area of a right triangle

**On** **Tutorela's**** blog**** you will find a wide variety of mathematical articles**