Question

長(zhǎng)方形有________條對(duì)稱軸；正方形有________條對(duì)稱軸；五角星有________條對(duì)稱軸．

Answer 1

2    4    5
分析：根據(jù)軸對(duì)稱圖形的定義，即可依次判斷出這些軸對(duì)稱圖形的對(duì)稱軸的條數(shù)及位置．
解答：長(zhǎng)方形有2條對(duì)稱軸，分別是經(jīng)過對(duì)邊中點(diǎn)的直線；
正方形有4條對(duì)稱軸，分別是經(jīng)過對(duì)邊中點(diǎn)的直線和對(duì)角線所在的直線；
五角星有5條對(duì)稱軸，分別是經(jīng)過中心和每個(gè)頂角的直線，
答：長(zhǎng)方形有2條對(duì)稱軸，正方形有4條對(duì)稱軸，五角星有5條對(duì)稱軸．
故答案為：2；4；5．
點(diǎn)評(píng)：此題考查了利用軸對(duì)稱圖形的定義判斷圖形的對(duì)稱軸條數(shù)的方法的靈活應(yīng)用．