Matching Pairs Properties of TriangleOnline version Types and formulas by Laudith Navarro 1 This si called the angeles sum property of a Triangle 2 Triangles can be classified in two mejor ways 3 Three sides, three angeles anda three vértices 4 AB=BC=AC Equilateral Triangle They sum of allá internal angeles of a Triangle is always equal to 180° Classification according to internal angles ando classification according to the length of its sides A Triangle has: