A triangle can be defined as a polygon with three sides and three angles. The sum of internal angles of a triangle is always 180 degrees and the sum of exterior angles is always 360 degrees.
There are several ways to calculate the area of a triangle. When the side lengths are used, it is the half of the multiplication of the base and the height which is perpendiculor to that base. Area = a * h / 2 .
There are several types of triangles and for all of them the area calculation is the same.
A right triangle has one internal angle of 90 degrees. The opposite side of that angle is called hypotenuse which is the longest side of the triangle.
A scalene triangle has sides with all different lengths, so the internal angles.
A isosceles triangle has 2 sides equal in length, whereas an equilateral trinagle has all sides equal in length, so the internal angles.
An obtuse triangle has one angle bigger than 90 degrees and an acute triangle has all angles less than 90 degrees.
The calculator below can be used to calculate the area of a triangle. Enter the length of the base and the hight and click on the "Calculate" button.