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Naming convention
An '''obtuse triangle''' has one angle that measures more than 90<sup>o</sup>.
An '''obtuse triangle''' has one angle that measures more than 90<sup>o</sup>.
==Naming conventions==
Usually, the vertices of a triangle are counter-clockwise denoted by big Latin letters, while small Latin letters are used for the sites: Every site will have the same letter as the opposite vertex.
The angles are denoted by Greek letters, if possible, the letter of an angle will correspond to the letter of the adjacent vertex.
==Congruence of triangles==
==Congruence of triangles==