call the triangle three-sided polygons, which are determined by three unaligned points we call vertices .
The vertices are the points of intersection of the sides and are denoted by capital letters. In the figure are A, B and C.
The sides are segments and are denoted with the same letter as the opposite corner but in lower case: in the figure are a, b, c.
angles are denoted with the same letter as the corresponding vertex.
The three basic elements of a triangle are sides, corners and angles.
CLASSIFICATION OF TRIANGLES .
To classify triangles can follow two criteria, their sides or angles. Below is a summary outline.
PROPERTY. The sum of the three interior angles of a triangle is 180 °
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