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ERIC Number: EJ1113005
Record Type: Journal
Publication Date: 2016-Sep
Pages: 6
Abstractor: As Provided
ISSN: ISSN-0025-5769
Closed Circular Chains
Caglayan, Günhan
Mathematics Teacher, v110 n2 p92-97 Sep 2016
A Steiner chain is defined as the sequence of n circles that are all tangent to two given non-intersecting circles. A closed chain, in particular, is one in which every circle in the sequence is tangent to the previous and next circles of the chain. In a closed Steiner chain the first and the "n"th circles of the chain are also tangent to each other. Windows of Norway's Akershus Castle and Fortress show patterns of a particular type with two concentric circles forming an annulus. The window of the Hall of Olav V depicts a closed Steiner chain made of n = 8 congruent circles within the annulus. This article focuses on such chains, also referred to as annular Steiner chains.
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191. Tel: 800-235-7566; Tel: 703-620-9840; Fax: 703-476-2570; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Norway; Sweden (Stockholm); Turkey (Istanbul)
Grant or Contract Numbers: N/A