# Area of a scalene triangle

The **area** of a **scalene triangle** can be calculated using Heron’s formula if all its sides (*a*, *b* and *c*) are known.

It could also be calculated if a side (*b*) is known and the height (*h*) associated with that side.

Finally, the **area** of a scalene triangle can also be calculated by **trigonometric procedures**, provided that three elements of the triangle are known, at least one of which is a side.

Download this **calculator** to get the results of the formulas on this page. Choose the initial data and enter it in the upper left box. For results, press ENTER.

Triangle-total.rar or Triangle-total.exe

Note. Courtesy of the author: **José María Pareja Marcano**. Chemist. Seville, Spain.

## Exercise

Find the area of the scalene triangle given its three sides: *a*=2 cm, *b*=4 cm and *c*=3 cm.

What is its area?

We can calculate the area using Heron’s formula. First, we have to determine the semiperimeter *s*:

Now, we can apply the Heron’s formula:

So the area is **2.9 cm ^{2}**.

## Table of Triangle Area Formulas

You can see the **table of triangle area formulas **. Depending on the type of triangle you may need one element (scalene triangle), two (base and height) or three (as long as they are not the three angles).