Rectangle Formula

Rectangle formulas include the formula for area, perimeter, and diagonal of a rectangle. To recall, a rectangle is a four sided polygon and the length of the opposite sides are equal. A rectangle is also called as an equiangular quadrilateral, as all the angles of a rectangle are right angled. A rectangle is a parallelogram with right angles in it. When the four sides of a rectangle are equal, then it is called a square.

Rectangle Formula

Formula for Rectangle

There are mainly three formulas for rectangle – Perimeter, Area and Diagonal. The formulas for area, perimeter, and diagonal of a rectangle are:

Rectangle Formulas
Perimeter of a Rectangle Formula P = 2 (l + b)
Area of a Rectangle Formula A = l × b
Diagonal of a Rectangle Formula D = \(\sqrt{l^{2}+b^{2}}\)

Solved Questions Using Formulas of Rectangle


Find out the length of the rectangle if the area is 96 cm 2 and the breadth is 16 cm.


As we know, the Area of a rectangle = l × b

Here the area is already given, so find the length of the rectangle.

So,96= l × 16

=>l= 96 ⁄ 16 i.e. Length = 6 cm

Practise This Question

Ram says that two chords are at equal distance from centre but the chords are not equal to each other. Is the statement stated by him true or false?