# Square Feet of a Triangle Calculator

Welcome to the **square feet of a triangle calculator**, where we'll explain all there is to know about **how to calculate the square feet of a triangle**. Let's get to the point and calculate some triangles' square feet!

## How do I use the square feet of a triangle calculator?

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

**Select the triangle type**from the drop-down list. You can find the square feet of triangles of these types:**base and height**;- Three sides (
**SSS**); - Side-angle-side (
**SAS**); and - Angle-side-angle (
**ASA**).

**Enter the measurements**of the triangle type you've selected. Refer to the schematic at the top of the calculator if you're unsure which measurements correspond to which fields.**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!

## How do I calculate the square feet of a triangle?

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, $A$.

### Base and height

The **base and height** triangle area formula simply uses the base $b$ and the height $h$:

### Three sides

When **all three sides** $a$, $b$, and $c$ are known, we can use Heron's formula,

where $s$ is the semiperimeter, $s = \tfrac{1}{2}(a+b+c)$.

### Side-angle-side

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

### Angle-side-angle

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

## Related calculators

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:

## FAQ

### What is the square feet area of a triangle with sides of 6 feet?

Its area is ** 15.59 ft²**. Since we know that

**all three sides**are 6 feet long, we can use

**Heron's formula**to work out its area in square feet.

- Calculate the perimeter:

`p = 3 × (6 ft) = 18 ft`

- Divide the perimeter in half to get the semiperimeter:

`s = ½p = 9 ft`

- Use Heron's formula:

`A = √[ s(s−a)(s−b)(s−c) ]`

`A = √[ 9 × (9 − 6)³ ]`

`A = √[ 9 × (3)³ ]`

`A = 15.59 ft²`

### How do I determine the square feet of scalene triangle?

If you know it's a scalene triangle, then chances are you already know its side lengths. In that case, you can use Heron's formula to determine the triangle's area:

`A = √[ s(s−a)(s−b)(s−c) ]`

Here, `s`

is the semiperimeter, which is half of the triangle's perimeter.