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All three sides of the same length, three angles equal (60 degrees). quadrilateral, quadrangle, tetragon quadrangle and tetragon are not common usages parallelogram both pairs of non-adjacent sides are parallel rhombus equilateral (also a parallelogram) decagon— Citizendium, the Citizens' Compendium - Recent changes [en]
Scalene triangle; a quadrangle; quadrilateral or tetragon 59— Mechanical Drawing Self-Taught
A figure that is bounded by four straight lines is termed a quadrangle, quadrilateral or tetragon.— Mechanical Drawing Self-Taught
Quadrangle, quadrilateral or tetragon, 59.— Mechanical Drawing Self-Taught
"Just a great big tetragon on a central pivot.— Operation Haystack
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