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Ng KC
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探究平行四邊形的特性
Activity
Ng KC
在釘點紙上畫垂直線
Activity
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創作一個相同周界的封閉平面圖形
Activity
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較複雜的周界問題(二)
Activity
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較複雜的周界問題(一)
Activity
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Parallel lines
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Perpendicular lines
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Two lines
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Closure shape
Activity
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