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四角形の各辺の中点を結ぶと？
Author:
小山英憲
GeoGebra
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正１７角形 作図 regular 17-gon
正１７角形 作図 regular 17-gon 2
目で見る立方体の2等分
sine-wave
小テスト
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MathA_Ex_69
円周角の定理の逆
Combination of sine and cosine functions 三角関数の合成
体3_158_ord1
平面の決定
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Constructions
Multiplication
Arithmetic
Trapezoid
Conditional Probability