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正十二面体 2
Author:
酒井良介
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M_iwate_2018_01
ピタゴラスの定理の拡張 その３
true or false game
区分求積③
折り紙の折り目
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Ex_62
Angles on a Straight Line
最大値 軸が動く
Reflection and refraction wave
正方形
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Conic Sections
Arithmetic
Quadrilaterals
Mathematics
Triangles
