Given area and side length a calculate perimeter diagonals and side b b A a P 2a 2b p q a 2 b 2. The diagonal of a rectangle calculator uses the same formula to calculate the length of the diagonal of the rectangle. According to the Pythagorean theorem the diagonal value can be found knowing the side length.
Diagonal of Square Formula textDiagonal of Square Formula s sqrt2 Where s represents the length of the side of the square.
A diagonal is a straight line that connects one corner of a rectangle to the opposite corner. Diagonal of a rectangle formula. Diagonal of Rectangle Formula textDiagonal of Rectangle Formula sqrta2 b2 Where a is the length of the rectangle. You also use the Pythagorean theorem to receive an approximate diagonal measurement.