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projection of x onto a1,a2,a3 in 3D
Author:
tttamaki
GeoGebra
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正１７角形 作図 regular 17-gon
二次曲線と離心率
対数螺旋
接点の作る円は内接円
sine-wave
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問題2－10 図5
平均値の定理（図形的意味）
正六面体
教科書p169考えよう（最短距離）
分数と「程度」
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Constructions
Geometry
Sphere
Inequalities
Quadratic Equations