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.
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 = \(\begin{array}{l}\sqrt{l^{2}+b^{2}}\end{array} \) |
Solved Questions Using Formulas of Rectangle
Question:
Find out the length of the rectangle if the area is 96 cm 2 and the breadth is 16 cm.
Solution:
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
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