a triangle
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Equilateral triangles have 3 sides of equal length, and 3 angles with measures of 60 degrees each.
rhombus
a parallelogram
Not necessarily. The definition for a rhombus is a polygon with four sides of equal length. Therefore, a square is a rhombus. However, any rhombus not as square does have two same sized acute and obtuse angles.
A parallelogram. A rhombus (a special case of parallelogram, with all 4 sides equal length) also fits this criteria.