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四角形の各辺の中点を結ぶと?
Author:
小山英憲
GeoGebra
New Resources
sine-wave
standingwave-plus
二次曲線と離心率
等積変形2
平均変化率
Discover Resources
等比級数の和
エッシャーのように3(正六角形)
円の接線と極線
白銀比・黄金比
円周角を使った相似の証明
Discover Topics
Division
Solids or 3D Shapes
Tree Diagrams
Similarity Transformation or Similarity
Quadrilaterals