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Lopez-Real, Francis – Mathematics Teaching, 2002
This article "opens up" the study of the relationship between quadrilaterals and circles to two sets of quadrilaterals--those that can be drawn either inside (cyclic) or outside (tangential) a circle (or both). Of course, "all" triangles are both cyclic and tangential. Or, to use the traditional Euclidean language for triangles, a unique…
Descriptors: Geometric Concepts, Plane Geometry, Mathematics Curriculum, Curriculum Development