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Equilateral triangle, regular 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.
a triangle is not regular
Equilateral Triangle - if that is what you mean
If by regular, you're referring to a regular polygon which has all sides equal length, and all angles equal, then an equilateral triangle is a regular triangle. If you draw a scalene triangle or an isosceles triangle then it will not be equilateral.