# 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}