To calculate result you have to disable your ad blocker first.

# Triangle Calculator

To find area & perimeter of triangle, input length (l), breadth (b), and click calculate button using triangle calculator

Table of Contents:

## What is a Triangle?

A **triangle **is a plane figure with straight sides and three angles. All of the interior angles add up to **180 **degrees. A triangle is a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices **A**, **B**, and **C **is denoted **ABC**.

A triangle is a three-sided polygon consisting of three line segments linked end-to-end.

- The interior angles of a triangle always add up to
**180**degrees - The exterior angles of a triangle always add up to
**360**degrees

**Formula**

`Area of a triangle: [l × b /2]`

`Perimeter of Triangle: [(a + b + c)]`

`Area of Equilateral Triangle: [(Sqrt (3)/4)×(side)²]`

`Area of Triangle SAS (2sides & opposite angle): [½×a×b×SinC]`

**Where,**

- l = length
- b =breadth
- a,b, and c = sides of the triangle

**Types of Triangle**

**There are seven types of triangles:**

- Isosceles triangle
- Equilateral triangle
- Scalene triangle
- Right angle triangle
- Obtuse triangle
- Acute triangle
- Equiangular

**How to calculate the area & perimeter of a triangle?**

__Example 1__:

Calculate the area of a triangle with a given length of **3 **and breadth of **4 **cm.

**Solution**

length = l = 3

breadth = b = **4 **cm

Take the formula and substitute the above values

**Area = **[l × b /2]

= (3*4/2) = 12/2 =** 6**

__Example 2__:

Calculate the Perimeter of a triangle with the given sides as 3, 4, and 5 cm.

**Solution**

a = 3 cm

b = 4 cm

c = 5 cm

Take the formula and substitute the above values

Perimeter = a + b + c

Perimeter** **= 3 + 4 + 5 = **12**