The figures, which have the same starting and the ending points are called the closed curves. Polygons are also the examples of the closed curves, which are formed by line segments. These are the figures formed by joining 3 or more line segments and so they form the closed figures.
We say that the polygons with three line segments are Triangles. And this way more different names are given to the polygons formed by joining different line segments. Here we will learn about scalene triangle in this unit. In Geometry we say that the triangles can be classified based on the length of their line segments. We observe that if line segments of the triangle are same, then we call it the Equilateral Triangle. On another hand we say that if the two sides of the triangles are equal, then the triangles are called Isosceles Triangle. Here we are learning about scalene triangles. The triangles which have the different length of the line segments, then the triangle so formed are called, scalene triangles. In scalene triangles, we say that the length measure of the triangles is different, so the length measure of the angles of the triangles are also of different measure. As the different sides of the triangle are not of same length in the scalene triangle are not same, but the sum of the angles sum of the triangle always remains same.
This sum of angles of the triangle is 180 degree. Thus we say that the property of sum of angles is equal is called angle sum property of the triangle. In scalene triangle, we say that if the two angles of the triangle are known, then we can find the third angle of the triangle by simply subtracting the sum of two angles of the triangle by 180 degrees.