References
- Greenberg , MJ . 1972 . Euclidean and Non-Euclidean Geometries , San Francisco, CA : W.H. Freeman & Co .
- Sharp , JM and Corrine , H . 2002 . What happens to geometry on a sphere? . Math. Teach. Middle School , 8 : 182 – 188 .
- Henderson , DW . 1996 . Experiencing Geometry on Plane and Sphere , New Jersey : Prentice Hall .
- Henderson , DW and Taimina , D . 2001 . Experiencing Geometry: In Euclidean, Spherical, and Hyperbolic Spaces , Upper Saddle River, NJ : Prentice Hall .
- NCTM . 1989 . Curriculum and evaluation standards for school mathematics . Reston ,
- Lenart , I . 1993 . Alternative models on the drawing ball . Educ. Stud. Math. , 24 : 277 – 312 .
- Stevenson , I and Richard , N . 1999 . Supporting the Evalution of Mathematical Meanings: The Case of Non-Euclidean Geometry . Int. J. Comp. Math. Learn. , 3 : 229 – 254 .
- Lenart , I . 1996 . Lenart Sphere Basic Set , Berkeley, CA : Key Curriculum Press .
- Lenart , I . 1996 . Non-Euclidean Adventures on the Lenart Sphere , Berkeley, CA : Key Curriculum Press .
- Goldenberg , EP and Couco , AA . 1998 . “ What is dynamic geometry? ” . In Designing Learning Environments for Developing Understanding of Geometry and Space , Edited by: Lehrer , R and Chazan , D . 351 – 367 . London : Lawrence Erlbaum Associates Publishers .
- Luthuli , D . 1996 . Questions, reflection, and problem solving as sources of inquiry in Euclidean geometry . Pythagoras , 40 : 17 – 27 .
- Guven , B . 2008 . Using dynamic geometry software to convey real-world situations into the classroom: The experience of student mathematics teachers with a minimum network problem . Teach. Math. Appl , 27 : 24 – 37 .
- De Villiars , MD . 2003 . Rethinking Proof with Geometer's Sketchpad 4 , Emeryville : Key Curriculum Press .
- Austin , D and Dickinson , W . 2002 . Spherical Sketchpad , URL. Available at http://merganser.math.gvsu.edu/easel/
- Polya , G . 1954 . “ Mathematics and Plausible Reasoning ” . In Induction and Analogy in Mathematics , Vol. 1 , Princeton : Princeton University Press .
- Chazan , D . 1993 . High school geometry students’ justification for their views of empirical evidence and mathematical proof . Educ. Stud. Math , 24 : 359 – 387 .