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http://dx.doi.org/10.7468/jksmec.2018.21.1.75

A Study on the Introduction and Explanation of the sum of the Angles of a Triangle in Elementary School Mathematics  

Hong, Gap ju (Dept. of Mathematics Education, Busan National University of Education)
Oh, Seong hun (Human and Mathematics Institute, Busan National University of Education)
Publication Information
Education of Primary School Mathematics / v.21, no.1, 2018 , pp. 75-91 More about this Journal
Abstract
This study examines the educational meaning of the sum of the angles of a triangle in elementary school mathematics and discusses the introduction and explanation methods to convey the meaning faithfully. First, we investigated how to introduce the sum of the angles of a triangle in the Korean national mathematics curriculums from the past to the present and surveyed the experiences and opinions of the teachers. The results of the survey are summarized and discussed in three parts: The context of 'arranging angles activities' and 'measuring angles activities', the methods to convey the meaning of the sum of the angles of a triangle as an invariance, and other details.
Keywords
triangle; sum of the angles of a triangle;
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