| Owen Byer, Felix Lazebnik and Deirdre Smeltzer, Methods for Euclidean Geometry, Mathematical Association of America, 2010, pp | |
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| A Study of Definition", Information Age Publishing, 2008, p | A Study of Definition", Information Age Publishing, 2008, p |
Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals.
16| with interactive animation illustrating a rectangle that becomes a 'crossed rectangle', making a good case for regarding a 'crossed rectangle' as a type of rectangle | Owen Byer; Felix Lazebnik; Deirdre L |
|---|---|
| Owen Byer, Felix Lazebnik and Deirdre Smeltzer, Methods for Euclidean Geometry, Mathematical Association of America, 2010, pp | with interactive animation illustrating a rectangle that becomes a 'crossed rectangle', making a good case for regarding a 'crossed rectangle' as a type of rectangle |
Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals.
2