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CBSE - VI
Use of Variables
Use of Variables
Variables are used to frame rules to find the perimeter of a polygon.
Lesson Demo
Variables are used to frame rules to find the perimeter of a polygon. The perimeter of a polygon can be obtained by adding the lengths of its sides. The following are simple rules to frame the perimeter of geometrical figures using variables.
If the length of the side is denoted by variable's', then the perimeter of a square is equal to |
 |
|
 |
If the lengths of the
sides of a triangle are denoted by |
 |
and its breadth variable 
then the perimeter of the triangle is
equal to 
The following are some simple rules for the properties of numbers using variables.
Commutative property of addition:
This property states that two numbers can be added in any order. If 
represent any two numbers, then 
Commutative property of multiplication:
This
property states that two numbers can be multiplied in any order. If represent any two numbers, then 
Associative property of addition:
This property states that three numbers can be added in any order. If 
represent any three numbers, then 
Associative property of multiplication:
This
property states that three numbers can be multiplied in any order. If represent any three numbers, then 
Distributive property of multiplication over addition:
This property states that if represent any three numbers, then 
