## How to Find Area of Triangle When 3 Sides or Coordinates are Given in Javascript Full Project For Beginners Welcome folks today in this blog post we will be building a `program to calculate area of triangle when 3 sides or coordinates are given` in javascript. All the full source code of the application is given below.

# Get Started

In order to get started create a `index.html` file and copy paste the code which is shown below

We will be taking all the `3 sides of triangle` as input by the user

`index.html`

``````<!DOCTYPE html>
<html>
<body>
</body>
<script>
// JavaScript program to find the area of a triangle

const side1 = parseInt(prompt('Enter side1: '));
const side2 = parseInt(prompt('Enter side2: '));
const side3 = parseInt(prompt('Enter side3: '));

// calculate the semi-perimeter
const s = (side1 + side2 + side3) / 2;

//calculate the area
const areaValue = Math.sqrt(
s * (s - side1) * (s - side2) * (s - side3)
);

console.log(
`The area of the triangle is \${areaValue}`
);
</script>
</html>``````

Now if you open `index.html` file inside the browser you will see the below result    