71. Geometry
    Geometry is left until the end of the year or left out in early elementary grades
    - Date of thread's last activity: 29 May 2003

72. Non-Euclidean Geometry
    Hyperbolic geometry and the angle of parallelism
    - Date of thread's last activity: 25 May 2011

73. Diagonals of polygons
    Relation between the number of vertices and number of diagonals in a polygon
    - Date of thread's last activity: 11 April 2007

74. Measurement
    Instructions on making and using a clinometer (sextant)
    - Date of thread's last activity: 17 May 2000

75. 360 degree circle
    The history that surrounds our 360 degree circle
    - Date of thread's last activity: 23 January 2007

76. Triangular prisms
    Using triangular prisms so students can practice measuring figures for surface area
    - Date of thread's last activity: 25 August 2006

77. Coordinates and plotting
    Lesson plan, activities, to teach coordinates and plotting
    - Date of thread's last activity: 9 September 2006

78. Clip art for geometry
    Clip art on the Web for geometry
    - Date of thread's last activity: 27 December 2006

79. Circles and Cutting A Cake
    Theorems that could be used to take a circular cake and cut it up evenly
    - Date of thread's last activity: 14 May 2000

80. Coordinate proofs
    Ideas about how to introduce, teach, practice, and assess a unit on Coordinate proofs
    - Date of thread's last activity: 23 May 2008

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