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Shadow of a Sphere
Author:
Tatsuyoshi Hamada
GeoGebra
New Resources
正１７角形 作図 regular 17-gon 2
対数螺旋
サイクロイド
sine-wave
standingwave-reflection-fixed
Discover Resources
figure_HS_229
方べきの定理（Power of a Point）
M_fujita_2016A_03
シェパード錯視
フェルマー点の垂足三角形
Discover Topics
Pythagoras or Pythagorean Theorem
Scatter Plot
Ellipse
Special Points
Matrices