not necessarily...
it can be any triangle.
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An equilateral polygon. All regular polygons, being equilateral, will have equal sides but it is not necessary that they are regular. A rhombus, for example, is equilateral but not regular.
A regular polygon must be equiangular as well as equilateral. A rhombus is an example of a polygon that is equilateral but not equiangular.
The minimum numbers of congruent faces are as follows: On an equilateral triangular prism: one pair of triangles On a right equilateral triangular prism: one pair of triangles and one triplet of rectangles.
five
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