a paralellagram
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Usually called "irregular" since "regular" polygons have equal sides, by definition. The word "scalene" typically refers to triangles with three unequal sides.
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The general name for a plane shape with four sides is a quadrilateral.
A congruent triangle is a triangle with all its sides being unequal to each other.
A polygon is an unequal six sided shape. A polygon or hexagon is the name used weather the sides are even or not.
A shape with four unequal sides is called an irregular quadrilateral.
QUARDILATERAL