A rhombus would seem to fit the description of an equal 4 sided parallelogram
No but it is a quadrilateral.
A parallelogram is a 4 sided geometric figure with opposite side parallel.
regular
When all three sides of a triangle are congruent, it is called an equilateral triangle.
An equilateral triangle.
An equilateral triangle
A rhombus is always equilateral. It need not be equiangular, but if it is, then most people look at it and call it a "square".
Equilateral triangle
Equilateral
equilateral triangle
An equilateral triangle
equilateral triangle