# What is a Triangle?

A triangle is a polygon with three sides. The sum of interior angles of a triangle is always 180°. The sum of the length of two sides of a triangle is always greater than the length of the third side

# How to find the area of the triangle?

## Area of a Triangle Using Basic formula

**Area of A triangle = ½ × c × h** {*Where c and h are the base and height of the triangle, respectively*}

## Area of a Triangle Using Heron’s formula

**Area of Triangle = √[ s(s-a)(s-b)(s-c)]** {

*Where s is the half of the Perimeter*of the

*triangle*}

## Area of triangle Using Trigonometry

**Area of A triangle = ****½ × b × c** **× sin *** A * {

*Where b and c are the adjacent sides of the triangle and A is the Angle between them*}

## Using circumcircle and Incircle of the triangle

### Using circumcircle

**Area of A triangle = (****abc****)****/****(****4R****)*** * {*Where a, b & c are the sides of a triangle and R is the circumcircle* of the triangle}

## Using incircle

**Area of A triangle = (****a+b+c****) r**

*/***2**

*{*

*Where a, b & c are the sides of a triangle and r is the incircle*of the triangle}

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