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If its acute angles are different then it is not a regular polygon but if it has 3 equal acute angles of 60 degrees then it is a regular equilateral triangle
An equilateral triangle.
An equilateral triangle, a square and a hexagon.
A triangle is a polygon. It can be regular or irregular. If it's regular, then all three sides are the same length, and it's called an "equilateral triangle". If all three sides aren't the same length, then it's an irregular polygon.
In general, a regular polygon is not required for a normal tetrahedron.An equilateral triangle is required for a regular tetrahedron.