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因為此三角形是等腰三角形, 所以兩邊相等,而第三條邊必不等(否則為等邊三角形) 又因為題設條件兩邊分別為3和4 所以假設3為腰長,4為底長,則另一邊亦等於3 同理假設4為腰長,3為底長,則另一邊長為4 所以另一邊等於3或4,周長亦等於3+3+4=10或4+4+3=11
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