A diagonal rectangle helps you calculate diagonal rectangle values accurately and instantly.
Calculate the diagonal of a rectangle from length and width using d = √(l² + w²)
d = √(l² + w²)
By the Pythagorean theorem, the diagonal of a rectangle is the hypotenuse of a right triangle with legs l and w.
The Rectangle Diagonal Calculator uses standard formulas to calculate your results. Enter your values in the input fields and click Calculate to see instant results.
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The Rectangle Diagonal Calculator uses verified formulas and provides accurate estimates for informational purposes. Results are calculated instantly in your browser.