Rectangle Diagonal Calculator

Easily calculate the diagonal of a rectangle using its length and width. Visualize the result and copy it with a click!

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Diagonal: units
The diagonal is calculated using the Pythagorean theorem: a2 + b2 = c2, where a and b are the sides of the rectangle, and c is the diagonal.

Visual Representation

Understanding Rectangle Diagonals

In geometry, a rectangle is a quadrilateral with four right angles. The diagonal of a rectangle is a line segment joining opposite vertices. Calculating the diagonal is a common problem in geometry and has practical applications in construction, design, and more. The formula to find the diagonal (d) of a rectangle with length (l) and width (w) is derived from the Pythagorean theorem: d = √(l² + w²). This tool helps you quickly compute this value and visualize the rectangle.