You can use the Pythagorean theorem to estimate the diagonal of a rectangle, which can be expressed with the following formula: d² = l² + w² , and now you should know how to find the diagonal of a rectangle explicit formula - just take a square root: d = √(l² + w²) .

What is the diagonal formula?

The formula to calculate the number of diagonal of an n-sided polygon = n(n-3)/2 where n is the number of sides of the polygon.

How do you find a diagonal of a square?

The diagonal of a square formula, is d = a√2; where 'd' is the diagonal and 'a' is the side of the square. The formula for the diagonal of a square is derived using the Pythagoras theorem.