Editing Rhomboid (section)

==History==
[[Euclid]] introduced the term in his ''[[Euclid's Elements|Elements]]'' in Book I, Definition 22,
{{blockquote|text=''Of quadrilateral figures, a square is that which is both equilateral and right-angled; an oblong that which is right-angled but not equilateral; a rhombus that which is equilateral but not right-angled; and a rhomboid that which has its opposite sides and angles equal to one another but is neither equilateral nor right-angled. And let quadrilaterals other than these be called trapezia.''|sign=Translation from the page of [[David E. Joyce (mathematician)|D.E. Joyce]], Dept. Math. & Comp. Sci., Clark University [http://aleph0.clarku.edu/~djoyce/java/elements/bookI/defI22.html]}}

Euclid never used the definition of rhomboid again and introduced the word [[parallelogram]] in Proposition 34 of Book I; ''"In parallelogrammic areas the opposite sides and angles are equal to one another, and the diameter bisects the areas."'' Heath suggests that rhomboid was an older term already in use.