How to find the perimeter of a triangle with examples

The perimeter of a triangle is the sum of the lengths of all three sides. The Perimeter of any plane figure is the sum of the lengths of its sides. A triangle is a three-sided plane figure. On this page, we will discuss the perimeter of a triangle in detail.

What is the perimeter of a triangle?

The perimeter of a triangle is the sum of the lengths of all three sides. i.e perimeter of a triangle = |AB|+|BC|+|AC|. In the triangle below, |AB| is = the base of the triangle, and h is the height.

How to find the perimeter of a triangle.

To find the perimeter of a triangle, follow the simple steps below.

• make sure all three sides have the same units of measurement.
• sum the lengths of all three sides
• simplify to get the perimeter of the triangle. Let’s understand better by working on some examples.

Example 1: Find the perimeter of the triangle below.

Solution

The perimeter of a triangle is = the sum of the lengths of all three sides.

= 4cm + 4cm + 3cm
= 11cm

Example 2: Find the perimeter of the triangle below

Solution

The perimeter of a triangle is = the sum of the lengths of all the three sides

= 3cm + 5cm + 4cm
= 12cm

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