等腰三角形有________條對(duì)稱軸，則其對(duì)稱軸在________．

等腰三角形有________條對(duì)稱軸，等邊三角形有________條對(duì)稱軸，矩形有________條對(duì)稱軸，圓有________條對(duì)稱軸．

等腰三角形有________條對(duì)稱軸，正方形有________條對(duì)稱軸，圓有________條對(duì)稱軸．

等腰三角形有________條對(duì)稱軸，等邊三角形有________條對(duì)稱軸，圓有________條對(duì)稱軸，它的對(duì)稱軸是________．