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  • 探究平行四邊形的特性

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  • 在釘點紙上畫垂直線

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  • 創作一個相同周界的封閉平面圖形

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  • 較複雜的周界問題(二)

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  • 較複雜的周界問題(一)

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  • Parallel lines

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  • Perpendicular lines

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  • Two lines

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  • Closure shape

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