Perimeter is the sum of all the sides of a closed figure.

Triangle is a three-sided polygon.

Perimeter of triangle is equal to the sum of all the three sides of the triangle.

**Perimeter of Triangle = Sum of its 3 sides **

**Question 1**

Find the perimeter of a triangle of sides 11 cm, 5 cm and 8 cm?

**Explanation**

Given:

Ist side = 11 cm

IInd side = 5 cm

IIIrd side = 8 cm

Perimeter of triangle = Sum of its sides

= ( Ist side + IInd side + IIIrd side ) cm

= ( 11 + 5 + 8 ) cm

= 24 cm

**Question 2**

Find the perimeter of a triangle of sides 12 cm, 4 cm and 16 cm?

**Explanation**

Given:

Ist side = 12 cm

IInd side = 4 cm

IIIrd side = 16 cm

Perimeter of triangle = Sum of its sides

= ( Ist side + IInd side + IIIrd side ) cm

= ( 12 + 4 + 16 ) cm

= 32 cm

**Question 3**

Find the perimeter of a triangle of sides 15 cm, 5 cm and 8 cm?

**Explanation**

Given:

Ist side = 15 cm

IInd side = 5 cm

IIIrd side = 8 cm

Perimeter of triangle = Sum of its sides

Perimeter of triangle = ( Ist side + IInd side + IIIrd side ) cm

= ( 15 + 5 + 8 ) cm

= 28 cm

**Question 4**

Find the perimeter of a triangle of sides 15 cm , 11 cm and 12 cm?

**Explanation**

Triangle is a three-sided polygon.

Given:

Ist side = 15 cm

IInd side = 11 cm

IIIrd side = 12 cm

Perimeter of triangle = Sum of its sides

= ( Ist side + IInd side + IIIrd side ) cm

= ( 15 + 11 + 12 ) cm

= 38 cm

**Question 5**

Find the perimeter of a triangle of sides 3.6 cm , 2.8 cm and 4.6 cm?

**Explanation**

Triangle is a three sided polygon.

Given:

Ist side = 3.6 cm

IInd side = 2.8 cm

IIIrd side = 4.6 cm

Perimeter of triangle = Sum of its sides

= ( Ist side + IInd side + IIIrd side ) cm

= ( 3.6 + 2.8 + 4.6 ) cm

= 11 cm

**Learn More…**

Perimeter of Rectangle

Perimeter of Square

Perimeter of Equilateral Triangle

Perimeter of regular pentagon

Perimeter of regular octagon

Perimeter of regular decagon

Area of Rectangle

Area of Square

Circumference of a Circle

Finding Diameter of a circle when circumference is given

Finding Radius of a circle when circumference is given

Finding Perimeter of Rectangle when Area & Breadth given

Finding Perimeter of Rectangle when Area & Length given

Find the dimensions of a rectangle

Find the cost of fencing of a rectangular field

Find the cost of carpeting the room

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