JavaScript Tutorial

The simplest way to calculate the area of a triangle is by using its base and height.

JavaScript Program to Calculate the Area of a Triangle Using Base and Height

Calculating the area of a triangle is an easy math task that can be quickly done with JavaScript. Whether you use fixed values, take inputs from users, or create a web form, JavaScript provides simple and flexible ways to solve the problem. In this guide, we will look at several methods to write a JavaScript program to calculate the area of a triangle, with detailed examples, step-by-step instructions, and outputs.
<h2 dir="ltr">Introduction to Calculating the Area of a Triangle in JavaScript</h2>
The area of a triangle can be calculated using the formula:
<pre class="language-javascript"><code>Area = (Base &times; Height) / 2</code></pre>
Alternatively, if the lengths of all three sides are known, you can use Heron&rsquo;s formula:
<pre class="language-javascript"><code>Area = &radic;(s &times; (s &ndash; a) &times; (s &ndash; b) &times; (s &ndash; c))</code></pre>
where s is the semi-perimeter of the triangle:
<pre class="language-javascript"><code>s = (a + b + c) / 2</code></pre>

Let&rsquo;s explore how to find the area of a triangle in JavaScript using these methods.

JavaScript Program to Calculate the Area of a Triangle (3 Ways)

This method allows the user to input the base and height values interactively.

JavaScript Program to Calculate the Area of a Triangle Using User Input

If the lengths of all three sides are known, Heron&rsquo;s formula can be used to calculate the area.

JavaScript Program to Calculate the Area of a Triangle Using Heron’s Formula

Here&rsquo;s how to calculate the area of a triangle in JavaScript using an HTML form.

JavaScript Program to Calculate the Area of a Triangle Using HTML Form for Interactive Input

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Learn how to write a JavaScript program to calculate the area of a triangle using 3 methods with examples in this complete program.