Square Feet of a Triangle Calculator

Using the square feet of a triangle calculator is easy! Follow these steps:

1. Select what you know about the triangle from the list. You can find the square feet of triangles if you know the following combination of length and angles:

   • Base and height;
   • Three sides (SSS);
   • Side-angle-side (SAS); and
   • Angle-side-angle (ASA).

2. Enter the measurements of the triangle type you've selected. Refer to the schematic if you're unsure which measurements correspond to which fields.

3. Let the square feet of a triangle calculator automatically find the area of the triangle.

If you want to learn how to find the square feet of a triangle by yourself, then keep scrolling!

It depends on what measurements of the triangle you already know. Most commonly, you'd have one of these sets of measurements at your disposal:

• Base and height;
• Three sides (also called SSS);
• Side-angle-side (SAS); or
• Angle-side-angle (ASA).

Let's look at each triangle type and see how we can calculate its area, .

Base and height

The base and height triangle area formula simply uses the base and the height :

Three sides

When all three sides , , and are known, we can use Heron's formula,

where is the semiperimeter, .

Side-angle-side

The SAS triangle has two sides and known, as well as the angle that lies in-between and . Its area formula is pretty simple:

Angle-side-angle

The ASA triangle has two angles and known, as well as the side in-between these angles. You can work out its area with:

If the square feet of a triangle calculator isn't covering as much area as you wanted, perhaps you'd be interested in our other triangle area calculators:

• Triangle area;
• Similar triangles;
• 3 sides triangle area;
• Scalene triangle area;
• Area of obtuse triangle;
• Area of oblique triangle;
• Area of triangle with coordinates; and
• Area of triangle SAS.