Perimeter of rectangle =2(l+b)Area of rectangle = l×b
perimeter of square = 4×s
area of square = s×s

Rectangle Formula:

A rectangle is a quadrilateral with opposite sides congruent and parallel to each other. The perimeter is the total distance around the rectangle, and the area is the measure of the space inside the rectangle. The formulas for calculating the perimeter and area of a rectangle are as follows:

Perimeter of a Rectangle:

The perimeter of a rectangle is the sum of the lengths of all its sides. Since opposite sides of a rectangle are congruent, we can simplify the formula to:

P = 2(l + w)

where P is the perimeter, l is the length, and w is the width of the rectangle.

Area of a Rectangle:

The area of a rectangle is the product of its length and width. The formula for calculating the area of a rectangle is:

A = l x w

where A is the area, l is the length, and w is the width of the rectangle.

Example:

Suppose we have a rectangle with a length of 8 cm and a width of 5 cm. We can use the formulas above to calculate its perimeter and area:

Perimeter = 2(l + w) = 2(8 + 5) = 2(13) = 26 cm

Area = l x w = 8 x 5 = 40 cm²

Therefore, the perimeter of the rectangle is 26 cm, and its area is 40 cm².