Audio and video pronunciation of Mathieu brought to you by Pronounce Names (http://www.PronounceNames.com), a website dedicated to helping people pronounce names correctly.
The interior angles of a triangle always add up to 180 degrees. If you make one angle bigger, another angle will become smaller: The exterior angles of a triangle always add up to 360 degrees: In every triangle, the shortest side is always opposite the smallest interior angle. The longest side is always opposite the largest interior angle. âOppositeâ means that the side does not touch the point of the angle on either end. Equilateral triangles must have three angles of 60 degrees each, and all triangles with three 60 degree angles are equilateral.
Triangles can be classified according to the lengths of their sides: 1  An equilateral triangle has all sides the same length. An equilateral triangle is also a regular polygon with all angles measuring 60Â°. 2  An isosceles triangle has two sides of equal length. An isosceles triangle also has two angles of the same measure, namely the angles opposite to the two sides of the same length; this fact is the content of the isosceles triangle theorem, which was known by Euclid.