Since you described it as 2 sets of parallel sides, I'll assume you meant a 4 sided polygon(quadrilateral). This special case is called a rhombus.
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An equilateral pentagon.pentagon
A polygon can only have sides. There are no interior or exterior sides: all sides are the boundaries of a polygon. They could be called equilateral although that names seems to be reserved for triangles.
A polygon is a plane figure bounded by straight sides. An equilateral polygon is one in which all the sides are of the same length.
That depends on what polygon you are looking at. An equilateral Triangle has three sides. An equilateral Square has four sides. And this goes for any shape that has equal length sides.
An equilateral polygon.