Perimeter and Area of a Triangle:-
Perimeter of triangle = Sum of lengths of all sides = a + b + c
Area of triangle = 1/2× base × height
Perimeter of an equilateral triangle = 3 × length of a side (if all the sides are equal)
For example:-
Find the perimeter of a triangle having each side length 12 cm.
Perimeter of triangle = 3 × 12 = 36 cm
Perimeter and Area of a Rectangle:-
Perimeter of a rectangle = 2 × (length + breadth)
Area = length × breadth
For example:-
The length and breadth of a rectangular swimming pool are 10 and 8 meters respectively .find the perimeter of the pool.
Solution:-
Perimeter of a rectangle = 2 × (length + breadth)
Perimeter of the pool = 2 × (10 + 8)
= 2 × 18
= 36 meter
Perimeter and Area of a Square:-
Perimeter of square = 4 × length of a side = 4a
Area of a square = Side × Side
For example:-
Find the perimeter of a square having side length 25 cm.
Solution:-
Perimeter of square = 4 × length of a side = 4a
4 x 25 = 100 cm
Perimeter of a ‘n’ sided polygon:-.
Perimeter of n sided polygon = n× length of one side.
For Example:-
Perimeter of the pentagon = 5a cm