There is no formula for a rectangle. There are formula for calculating its area, perimeter or length of diagonals from its sides, or it is possible to calculate the length of one pair of sides given the other sides and the area or perimeter, or the two lots of sides given area and perimeter and so on.
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Area of a rectangle: a = l * w
The formula for perimeter of a rectangle is: P=2L+2W where L is the length and W is the width of the rectangle.
Area of rectangle is l x b. Where l is length and b is breath of the rectangle.
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it is the formula for both a rectangle and a square. remember a square is a rectangle, but a rectangle is not a square (what i mean is a square has to have all 90 degree angles and four sides that are all the same length a rectangle doesn't have all the same lengths. but a rectangle is a shape with all 90 degree angles, and a square fits that discription)