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Author:h6741957g

Topic:Orthocenter

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兩組對邊相等的四邊形
四邉形 (四年級) 教師版
算柱 (兩位數)
兩位數除以一位數（一）
拼砌四邊形

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正多邊形滾動
三角形內接正方形
判斷柱體10
認識圓
球面截痕

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Limits
Real Numbers
Rectangle
Surface
Ellipse

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