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円の面積（分割）
Author:
Tsuyoshi Yamamoto
GeoGebra
New Resources
sine-wave
standingwave-reflection-fixed
目で見る立方体の2等分
円の伸開線
standingwave-reflection-free
Discover Resources
円の内部で直交する2直線2
separation by a line
testggb
円周角の定理の逆
駒東2345
Discover Topics
Statistical Characteristics
Triangles
Complex Numbers
Plane Figures or Shapes
Intersection