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垂心の存在の証明
Author:
斎藤 幸弘
GeoGebra
New Resources
standingwave
円の伸開線
sine-wave
正１７角形 作図 regular 17-gon
standingwave-reflection
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相似
空間の座標
平行四辺形の座標
おりかえして おえかき
新教科書p１６５
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Curve Sketching
Linear Equations
Tangent Line or Tangent
Rational Numbers
Cylinder