there is a right triangle an iscosoles trinagle and another one i cannot remember=P
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An isosceles triangle is a triangle with at least two equal sides. While there are no other names, an equilateral triangle has 3 equal sides so it is also an isosceles triangle
Irregular triangle
You list them any way you like. You can refer to them by the names of the vertices ot their ends, or you can give them any other names.
equalateral, isosiles, and right triangle
A triangle is the 2D name of a certain shape. A triangle has three sides and, in the case of a right angled triangle, has an angle of 90 degrees in one corner. There are many other names depending on the angles used.