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ERIC Number: EJ1082085
Record Type: Journal
Publication Date: 2015-Nov
Pages: 1
Abstractor: ERIC
ISSN: ISSN-0025-5769
Dynamic Right Triangles
Koyunkaya, Melike Yigit; Kastberg, Signe; Quinlan, James; Edwards, Michael Todd; Keiser, Jane
Mathematics Teacher, v109 n4 p320 Nov 2015
Right triangles play a significant role in mathematics. In this favorite lesson, the authors help students understand variant and invariant properties by considering relationships among angle measures and side lengths in right triangles. Students explore these relationships using interactive mathematics software, changing one angle and observing the effect on the side lengths and other angles. Students observe that while some properties of the triangle vary, others remain constant, or "invariant".
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191-1502. Tel: 800-235-7566; Tel: 703-620-3702; Fax: 703-476-2970; e-mail:; Web site:
Publication Type: Journal Articles; Guides - Classroom - Teacher; Reports - Descriptive
Education Level: N/A
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A