How to find the area of a triangle using JavaScript ?
Last Updated :
28 Dec, 2023
We are given a triangle, and we need to find the area of a triangle using JavaScript.
Below are the approaches:
Approach 1: When height is known
When the height(h) and base(b) are known then we could use the Formula to find the Area of the Triangle:
area = (base * height) / 2
Example: Below is an example of the above-explained approach.
Javascript
function triangleArea(base, height) {
return 0.5 * base * height;
}
let baseLength = 10;
let heightLength = 5;
let area = triangleArea(baseLength, heightLength);
console.log(`The area of the triangle is: ${area}`);
|
Output
The area of the triangle is: 25
Approach 2: When all sides are known
When all sides(s1, s2, s3) are known then we could use:
Formula to find the Area of the Triangle:
let s = (side1 + side2 + side3) / 2;
let area = Math.sqrt(s * ((s - side1) * (s - side2) * (s - side3)));
Example: This example shows the area of triangle using JavaScript.
Javascript
function triangleArea(side1, side2, side3) {
let s = (side1 + side2 + side3) / 2;
return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
}
let side1Length = 3;
let side2Length = 4;
let side3Length = 5;
let area = triangleArea(side1Length, side2Length, side3Length);
console.log(`The area of the triangle is: ${area}`);
|
Output
The area of the triangle is: 6
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