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Trick Tangram

Author:philomathesis

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standingwave
円の伸開線
対数螺旋
sine-wave
接点の作る円は内接円

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相似１
「四角形のしきつめ」から面積を求める
相似の内心と外心
森原の定理
三角関数（正弦、余弦）

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Volume
Probability
Coordinates
Difference and Slope
Combinatorics

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