Full Issue | Delta-K
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George Cathcart
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Teach Nothing About Geometry
Alton T. Olson
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Shaping Up Geometry, K-12
Donald R. Kerr Jr.
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Thought Levels in Geometry
Alan R . Hoffer
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How to Draw an Octagonal Figure Quickly
William J. Bruce
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Problem Corner
edited by William J. Bruce and Roy Sinclair
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Geoboard Investigations
George Cathcart
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Patterns in the Angles of Regular Polygons
George Cathcart