# Perimeter of a triangle calculator

A triangle is a two-dimensional shape that has three sides with three vertices joining its sides. Like all other geometrical shapes (except circles), we can find its perimeter depending on the measures of its sides. The formula to find the perimeter varies with the type of triangle we are dealing with.

It will be difficult to remember all formulas to use in this regard. You can use the perimeter of a triangle calculator that we have to make this process easier. This maths calculator will help you in finding the perimeter of any triangle within a few seconds. Just insert the values and it will show the measurement of the perimeter.

## What is the perimeter of a triangle?

The perimeter of a triangle is the addition of all measures of its sides. In simple words, it shows how long a triangle can be extended if its sides are connected one by one. We can say that the perimeter of a triangle is the collective length of all its side’s lengths.

### Perimeter of a triangle formula

The formula of the perimeter of a triangle depends on the type of triangle. We all know that a triangle has three major types that include the one with different side measures (Scalene), the one that has two sides of equal measures (Isosceles), and the third one with all sides of equal measures (Equilateral).

So, we have written the formulas to find the Perimeter of all types of triangles here.

Perimeter of a Scalene Triangle = a + b + c


Here, “a”, “b”, and “c” shows the measures of the sides of a triangle.

Perimeter of an Isosceles Triangle = 2a + b


Here, “a” represents the sides with equal measures while “b” represents the side with a different length.

Perimeter of an Equilateral Triangle = 3a


As this triangle has all sides of equal measures, so, “a” represents that length.

## How to find the perimeter of a triangle?

Depending on the type of triangle, we can choose the formula from the above list and use it to find the Perimeter. For your ease, we have solved an example for a Scalene triangle.

Example 1:

Find the perimeter of a triangle with sides of measures 3m, 6m, and 8m.

Solution:

As we know,

Perimeter of a Scalene Triangle = a + b + c


So,

= 3 + 6 + 8

= 17m


### How to use the perimeter of a triangle calculator?

To make this process easier and faster, you should use Calculator’s Bag. This calculator has been designed simply to let everyone use it. Here are the steps you need to follow for using it.

• insert the measure of side A
• Insert the measure of side B
• Insert the measure of side C
• This calculator will automatically show you the value of the Perimeter of your concerned triangle

### FAQ | Perimeter of a triangle calculator

How do you find the perimeter of a triangle with 3 points?

If we are given three points only, we have to find the lengths of all sides using those points. After that, we only have to add the measures of sides or use a particular formula depending on the type of triangle.

How do you find the perimeter of an unknown side of a triangle?

First, we have to find the length of the side of a triangle. Without side measurements, we can’t find the perimeter of a triangle.

Does a triangle’s perimeter add up to 180?

No, the perimeter can be of any measure.

Do all 3 angles of a triangle add up to 360?

No, the sum of all angles of a triangle must be equal to 180.

How do you find the perimeter with only one side?

If the measure of one side of a triangle is given, it is assumed to be an equilateral triangle. So, we have to multiply the given measure by 3 to find its perimeter.