Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals A Study of Definition", Information Age Publishing, 2008, pp
Owen Byer, Felix Lazebnik and Deirdre Smeltzer, Methods for Euclidean Geometry, Mathematical Association of America, 2010, pp Note: 's original definition and some English dictionaries' definition of rhombus excludes squares, but modern mathematicians prefer the inclusive definition

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A Study of Definition", Information Age Publishing, 2008, p.

19
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Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals
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متوازي أضلاع
Owen Byer, Felix Lazebnik and Deirdre Smeltzer, Methods for Euclidean Geometry, Mathematical Association of America, 2010, p

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معين (هندسة رياضية)
معين (هندسة رياضية)
معين (هندسة رياضية)