equalateral, isosiles, and right triangle
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If it's a right angle triangle then the sides are: opposite, adjacent and hypotenuse which is the longest side
adjacent, opposite and hypotenuse
If it were, there would be no need to have two different names for it. An isosceles triangle has two equal sides. An equilateral triangle has all three sides equal.
Irregular triangle
Regular, Acute, and Equilateral * * * * * Regular and Equilateral are correct but not Acute. An acute triangle with angles of 50,60 70 degrees for example, is not regular. An equiangular triangle is the third possible name.