@article{oai:air.repo.nii.ac.jp:00004632,
 author = {大澤, 弘典 and OSAWA, Hironori},
 journal = {東北数学教育学会年報, Journal of Tohoku Society of Mathematics Education},
 month = {Mar},
 note = {欠落角の二等分線を求める課題に係わって数学的な内容面から分析・考察し，中学校における数学の教材としての可能性を探究した。その結果，次のことが分かった。（１）欠落角の二等分線を求める課題の解決は多様であり，生徒が図形についての知識を深める教材になりうる。（２）また，欠落角の二等分線を求める課題の解決過程においてミスコンセプション（何らかの論理的な根拠に基づく誤りのある考え）が少なからず発生しやすく，生徒が論証力を高めるのに有効な教材になりうる。

In this paper, I considered the potential in the junior high school as the teaching material of mathematics from the mathematical content side for "missing angle". As a result, the following suggestions emerged. The solution of problem of "missing angle" is various. Teaching materials related to "missing angle" will be able to become teaching materials which students deepen the knowledge of geometrical. Moreover, some teaching materials will be able to improve students' proof power in using the mistake of mathematics that happens by the problem-solving process of "missing angle".},
 pages = {22--29},
 title = {「欠落角の課題」の教材としての可能性},
 volume = {46},
 year = {2015}
}