Diagonal do Losango
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
l = √((D/2)²+(d/2)²)
About this calculator
The rhombus diagonal calculator determines the side length of a rhombus from its major (D) and minor (d) diagonals. A rhombus is a quadrilateral with all sides equal and perpendicular diagonals that bisect each other. The formula used is l = √((D/2)² + (d/2)²), derived from the Pythagorean theorem applied to one of the four right triangles formed by the diagonals.
To use the calculator, enter the values of the major and minor diagonals in the corresponding fields. The result will be the side length of the rhombus. This tool is useful in geometry problems, engineering projects, architecture, or crafts involving rhombus shapes, such as in stained glass, flooring, or decorative structures.
Precautions: ensure the diagonals are perpendicular and bisect each other. The formula is valid only for true rhombuses, not other parallelograms. Check units for consistency. Remember that both diagonals must be positive and non-zero.
Frequently asked questions
Can I use this calculator for any quadrilateral?
No, it works only for rhombuses, where diagonals are perpendicular and bisect each other.
What if I have only the side and one diagonal?
Use the derived formula: D = 2√(l² - (d/2)²) or d = 2√(l² - (D/2)²), depending on which diagonal you have.
Does the calculator accept different units?
Yes, as long as the diagonals are in the same unit. The side will be calculated in the same unit.
Why does the result look odd if the diagonals are very different?
That is normal. The larger the difference, the more elongated the rhombus. The formula is still valid.