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如果一個圖形沿着一條直線對摺,兩側的圖形能完全重合,這個圖形就是軸對稱圖形.摺痕所在的這條直線叫做對稱軸.其實:對稱軸是一條直線! 線段垂直平分線的定義:垂直並且平分一條線段的直線稱為這條線段的垂直平分線,或中垂線.線段垂直平分線上的點到線段兩端的距離相等. 在軸對稱圖形中,對稱軸兩側相對的點到對稱軸兩側的距離相等
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