41. Tessellation shapes
    What kinds of shapes tessellate?
    - Date of thread's last activity: 28 October 2008

42. Geometry etymology
    Where to find information on "etymologies"
    - Date of thread's last activity: 2 November 2003

43. Geometric representations
    Pictorial representations of Topology, Hinge Theorem, Euler line, and Archimedian Solid
    - Date of thread's last activity: 3 December 2007

44. Parabolas
    Real application of parabolas
    - Date of thread's last activity: 22 April 2007

45. Properties of a circle and other shapes
    Properties of a circle and other shapes
    - Date of thread's last activity: 6 September 2007

46. Teaching and learning of the circle theorems
    Information about circle theorems and teaching these concepts to high school students
    - Date of thread's last activity: 17 November 2010

47. Student preparation for Geometry
    Geometry readiness test for Algebra 1 students
    - Date of thread's last activity: 11 May 2001

48. Measuring arc length
    How to find the length of a curved line
    - Date of thread's last activity: 14 September 2012

49. Use of matrices in transformation
    Transformations using matrices
    - Date of thread's last activity: 13 February 2008

50. Geometer's Sketchpad lesson plans
    Lesson plan for Geometer's Sketchpad
    - Date of thread's last activity: 30 April 2007

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