Formula - Definition with Examples

What is Formula?

Examples of formula:

Perimeter of rectangle = 2(length + width)

If the length and width of a rectangle are ‘a’ units and ‘b’ units respectively, the formula of its perimeter is:

P = 2 (a + b)

Area of rectangle = length × width

If the length and width of a rectangle are ‘a’ units and ‘b’ units respectively, the formula of its area is:

P = a × b

Perimeter of square = 4 × side length

If the length of the side of a square is ‘a’ units, then its perimeter P is the sum of all its sides.

P = a + a + a + a

P = 4a

Area of square = Side length × side length

If the side length of the square is a units; then its area is:

Area = a × a = a² 

Volume of cuboid = length × width × height

Profit = Selling price - cost price

Loss = Cost price - selling price

Non examples:

2x - 3 = 6

x + y = 10

3x - 8x + 9x = 17

These are equations and not formula.