LEARN MATH STEP BY STEP THROUGH VERY EASY PROCESS

INTRODUCTION OF FORMULAE

__INTRODUCTION OF FORMULAE __

**A formula is a relation between certain quantities. A
relations (equation) between two or more quantities is called a formula. For
example, if ‘l’ is the length of a rectangle and ‘b’ = the breadth of the
rectangle, its perimeter ‘p’ can be expressed by the following formula that
you are already familiar with. P = 2 (
l + b )**

**Literals are used to represent the variables or quantities
in a formula, certain literals are traditionally used to represent particular
quantities **

**If you know the values of all expect one of the quantities
in a formula, you can work out the unknown quantity. let us consider a few
formulae you have come across earlier.**

**Examples - **

** 1) The
perimeter ‘p’ of a square is four times of its side ‘a’. this can be represented
by the formula p = 4a**

** 2) The volume ‘Vv’ of a cuboid is the product of its length ‘Ll’, breadth
‘Bb’ , and height ‘Hh’. This is expressed by the formula, Vv = Ll X Bb X Hh**

** 3) The work done ‘Ww’ is the product of the force ‘Ff’ and the distance
‘Dd’ through which a body moves. then the formula is Ww = Ff X Dd**

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** 4) Suppose the sum of two numbers
is 20, then the required formula is y + z = 20, y & are the unknown numbers.**