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三角形の面積
Author:
小林 誠
GeoGebra
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standingwave-reflection-fixed
斜めドップラー
standingwave-reflection
小テスト
standingwave
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三円交線その２
９点円（三角形の不思議な円）
三角形の直角双曲線と漸近線
等積変形の問題２
Similar transformation(相似形の変身)ver.2
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Cylinder
Distributions
Piecewise Functions
Perimeter
Quadratic Equations