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ERIC Number: EJ781147
Record Type: Journal
Publication Date: 2007-Nov
Pages: 3
Abstractor: ERIC
Reference Count: N/A
ISSN: ISSN-0025-5785
Yes, but Can They Solve Right-Angled Triangles?
Hancock, John
Mathematics Teaching Incorporating Micromath, n205 p39-41 Nov 2007
Over the years the technology behind displaying the image of the unit circle has changed, but the defining features remain constant. The key question for the author as a teacher is this: are the relationships embodied in the image simple, memorable and rich enough to be grasped by any KS3 student at his school? It needs to be simple enough to allow all students in the class to participate in the lesson and make progress. It needs to be durable enough for students to reconstruct the picture themselves when they are stuck. It needs to be rich enough (a meta-image?) to aid the understanding of trigonometry beyond right-angled triangles. In this article, the author tries to suggest that the image of the unit circle and its associated relationships are accessible to all students. It can lead to language-rich lessons where students are practising their English skills as well as exploring a mathematical idea, which can be extended in lots of directions, including the solution of right-angled triangles. (Contains 1 figure.)
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: Grade 6; Grade 7; Middle Schools
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: United Kingdom