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三角形の内角と外角の二等分線
Author:
Junichi Kawamura
GeoGebra
New Resources
小テスト
sine-wave
standingwave-reflection-fixed
正１７角形 作図 regular 17-gon
円の伸開線
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問題2－9 図2
２つの三角形の問題
区分求積法
問題１３
円周角の定理の逆
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Interest Calculation
Equilateral Triangles
Integers
Circle
Special Points