Well if your talking about a regular triangle (equilateral triangle) it is because if you measure it then it will always equal 60 degrees on each turn. Which then Equals 180 (This is for all triangles).
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that's an iscoceles triangle...
A square's sides have equal lengths, and an equilateral triangle's sides also have equal lengths.
It is a scalene triangle that has three different lengths and no angles are equal in size.
A triangle with sides that do not have equal lengths.
You must have more information to determine what type of triangle it is. If two of the lengths are equal, it is isosceles. If all three of the lengths are equal, it is equilateral. If none of them are equal, it is scalene. It may also be a right triangle if it is isosceles or scalene.