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２つの正三角形
Author:
Tsuyoshi Yamamoto
GeoGebra
New Resources
standingwave-reflection
円の伸開線
standingwave-reflection-fixed
目で見る立方体の2等分
接点の作る円は内接円
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MathA_Ex_66
９点円の証明
辺上を動く点6
斜面の斜方投射
等差数列の一般項と第ｎ項を求める
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Tangent Line or Tangent
Area
Kite
Planes
Mode