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【1】長方形、正方形、三角形和圓比較,長方形、正方形、三角形都是直線(線段)組成的圖形,而圓是曲線組成的圖形.【2】畫圓的方法有三種:1)可用元規劃;2)可用一普通棉線或絲線作為半徑,左手按住棉線一端,右手握…
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