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Improved answer:
All three sides are equal.
Each three interior angles are 60 degrees.
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Squares have four sides, triangles have three.
An equilateral triangle has 3 equal sides and 3 equal interior angles each measuring 60 degrees
An equilateral triangle is the joining or putting together of three straight lines, all of equal length, to form a triangle
A Rhombus. If it makes two equilateral triangles with a diagonal, the shape must have all four sides of equal length; thus it is a rhombus, possibly a square. As an equilateral triangle is made, the angle between two of the sides is 60o; which is not 90o, so it can't be a square, so it must be a rhombus.
Two equilateral triangles or one rhombus.