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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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standingwave
円の伸開線
直方体の対角線
対数螺旋
正１７角形 作図 regular 17-gon 2
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poly_cheba
三角形幾何学
数学I 2次関数の符号(2)
a 円積み上げ
No,39-問4
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Similar Triangles
Equilateral Triangles
Cosine
Cuboid
Boxplot