How to Find Perimeter of a Triangle? NCERT Maths Note for Exams
BY Team Aakash Byju's
Perimeter Of Triangle: - The complete distance around a shape is referred to as its perimeter.- A triangle's perimeter is equal to the sum of its three sides.
Types of triangles:- Equilateral triangle.- Isosceles triangle.- Scalene triangle.
In an Equilateral triangle all three sides and three angles are Equal and Each angle will be 60 degrees.
Equilateral Triangle :
Example:
Find the perimeter of an equilateral triangle with side 8 cm.sol: Given, side of an equilateral triangle = 8 cm.
we know that, in an equilateral triangle all three sides are equal. so perimeter = sum of all sides = 3 x side= 3 x 8 cm = 24 cm.
In an isosceles triangle only two sides are equal and the base angles are equal.
Example: Find the perimeter of the triangle whose sides are AB = AC = 3 cm and BC = 4 cm.
Sol: Given,
sides of the triangle are
AB =AC = 3 cm, BC = 4 cm
Here two sides are equal that means it is an isosceles triangle. we know that Perimeter of triangle = sum of all three sides.
Therefore, the perimeter of the given triangle = AB + BC + CA= 3 cm + 4 cm + 3 cm = 10 cm.
Scalene triangle: In the Scalene triangle all three sides are unequal.
Scalene triangle:
Find the perimeter of a triangle whose sides are AB =2.5 cm,BC = 3 cm and AC = 4.5 cm.sol: Given, sides of a triangle are AB = 2.5 cm, BC = 3 cm and AC= 4.5 cm.
Example:
Here all sides are different so it is an scalene triangleperimeter = sum of all sides = AB + BC + AC = 2.5 cm + 3 cm + 4.5 cm = 10 cm