Three triangles are:
scalene, which has three sides of different lengths,
isosceles, which has two sides with the same length, and
equilateral, which has three sides that are all the same length.
In the picture, the scalene triangle is triangle RST, the isosceles triangle is triangle XYZ, and the equilateral triangle is triangle ABC. If two sides or more sides of a triangle have a little line on them, then they are the same length. Click on the related link, "Three Triangles", to see them.
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There is no such triangle with a sum of angles different that 180 degrees.
tri as in 3 angles as in the ends . He's right but i wil explain more. Equilateral triangles get there name from all sides being equal hence the name equilateral. Right triangles get there name from having a right angle, or ninety degree angle. I don't know about iscoceles.
yes
There are an infinite number of different polygons, and some have them have more than one name.
There are: Isoceles, Right, Scalene, and Equilateral.