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ERIC Number: EJ775294
Record Type: Journal
Publication Date: 2002-Jun
Pages: 5
Abstractor: ERIC
Reference Count: 0
ISSN: ISSN-0025-5785
Cyclic and Tangential Polygons 1: Extending a Familiar Concept
Lopez-Real, Francis
Mathematics Teaching, n179 p3-7 Jun 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 circumcircle and a unique incircle can be constructed for any triangle. In this article, the author extends this line of inquiry to other polygons. (Contains 14 figures.)
Association of Teachers of Mathematics. Unit 7 Prime Industrial Park, Shaftesbury Street, Derby, DE23 8YB, UK. Tel: +44-1332-346599; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Adult Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A