Question 261510
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Any polygon with exactly 4 sides is a quadrilateral.  After all, that is what the word quadrilateral means.  Quadri means 4 and lateral means side.


If no pair of sides is parallel, then the figure is a general quadrilateral or it is a kite.  It is a kite if it has two pairs of adjacent sides that are of equal measure.  It is a general quadrilateral otherwise.


If one pair of sides is parallel, but the other is not parallel, then the figure is a trapezoid.  That is, unless you live in the UK or otherwise speak British rather than American English, in which case it is a trapezium.


If the figure has two pairs of parallel sides the figure is a parallelogram.


A parallelogram with 4 sides of equal measure is a rhombus.


A rhombus with 4 interior angles of equal measure is a square.


A general parallelogram (not a rhombus) with 4 interior angles of equal measure is a rectangle.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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