# Formulas for Area of a Triangle.

There are a lot of formulas and techniques to find the *area of a triangle*. We can use many different formulas to calculate area of a triangle according to the given conditions. Here we shall derive some of the main *formulas* used to calculate area of a triangle.

**Formulas for Area of a Triangle**:

The area of a triangle is denoted by the symbol delta ( )

We shall appeal to the formula:

And the half angle formula:

etc.

Where “s” is the semi circumference of the triangle or,

**We shall now derive different formula for the area of triangle**:

First formula for the area of a triangle:

Second formula for the area of a triangle:

Now , as 2s = (a+b+c)

Third formula for the area of a triangle:

Now using sine law:

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