The area formula can be derived from a triangle of any shape.
The formula is applicable to a triangle of any shape. No matter what is the shape of the triangle, the formula for the area of a triangle will always be:
Area[tex] =\frac{1}{2}\times base\times height [/tex]
and this formula will give the area of any triangle, whether that be a triangle which has acute angles, or it can be a triangle that has an obtuse angle, or it can be a right angled triangle. The above mentioned formula is applicable in all the cases.
Please note that we can choose any side as the base and the height will be corresponding to the base chosen. The formula can be applied after the base and the height have been identified.
