The diagonal of a rectangle is the third and longest side of a triangle with sides the same as those of the rectangle, so its length is the square root of the sum of the squares of the lengths of the sides of the triangle, (Pythoagoras' Theorem) which are also the sides of the rectangle. If the rectangle is 3 inches by 4 inches, then the diagonal is the square root of 3 squared (= 9) and 4 squared (= 16) so the diagonal is the square root of 16 + 9 = 25, giving it the length of 5 inches.
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A diagonal cannot be a side of a rectangle, and a side cannot be a diagonal.
The diagonal is 25 feet.
The diagonal is 3.61cm
To find the diagonal length of a rectangle use Pythagoras' theorem for a right angle triangle.
240 sq m