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為便描述:設線l切掉正方形一角,m將餘下分為兩三角形1、l過正方形兩頂點,則餘下部分為三角形,m經過其中一頂點即可2、l過正方形一頂點一邊,則餘下為梯形,m為正方形在梯形內的對角線3、l過正方形兩條邊,則m不存在
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