JavaScript Program To Calculate The Area Of A Triangle - Programiz

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JavaScript Program to Calculate the Area of a Triangle

To understand this example, you should have the knowledge of the following JavaScript programming topics:

  • JavaScript Operators
  • JavaScript Math.sqrt()

If you know the base and height of a triangle, you can find the area using the formula:

area = (base * height) / 2

Example 1: Area When Base and Height is Known

const baseValue = prompt('Enter the base of a triangle: '); const heightValue = prompt('Enter the height of a triangle: '); // calculate the area const areaValue = (baseValue * heightValue) / 2; console.log( `The area of the triangle is ${areaValue}` );

Output

Enter the base of a triangle: 4 Enter the height of a triangle: 6 The area of the triangle is 12

If you know all the sides of a triangle, you can find the area using Herons' formula. If a, b and c are the three sides of a triangle, then

s = (a+b+c)/2 area = √(s(s-a)*(s-b)*(s-c))

Example 2: Area When All Sides are Known

// 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}` );

Output

Enter side1: 3 Enter side2: 4 Enter side3: 5 The area of the triangle is 6

Here, we have used the Math.sqrt() method to find the square root of a number.

Note: If a triangle cannot be formed from the given sides, the program will not run correctly.

Also Read:

  • JavaScript parseInt()

Tag » Area Of Triangle Javascript Code