| Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals | Owen Byer, Felix Lazebnik and Deirdre Smeltzer, Methods for Euclidean Geometry, Mathematical Association of America, 2010, pp |
|---|---|
| A Study of Definition", Information Age Publishing, 2008, pp | A Study of Definition", Information Age Publishing, 2008, p |
Zalman Usiskin and Jennifer Griffin, "The Classification of Quadrilaterals.
| A Study of Definition", Information Age Publishing, 2008, 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 | Owen Byer; Felix Lazebnik; Deirdre L |
Owen Byer; Felix Lazebnik; Deirdre L.