Question

正方形有

4

條對(duì)稱軸，長(zhǎng)方形（長(zhǎng)≠寬）有

2

條對(duì)稱軸，等邊三角形有

3

條對(duì)稱軸，圓有

無(wú)數(shù)

條對(duì)稱軸．

Answer 1

分析：一個(gè)圖形沿一條直線對(duì)折，直線兩旁的部分能夠完全重合，這個(gè)圖形就是軸對(duì)稱圖形，這條直線就是它的對(duì)稱軸；據(jù)此并結(jié)合對(duì)軸對(duì)稱圖形的認(rèn)識(shí)，進(jìn)行解答即可．

解答：解：根據(jù)軸對(duì)稱圖形的定義可得：正方形有4條對(duì)稱軸，長(zhǎng)方形（長(zhǎng)≠寬）有2條對(duì)稱軸，等邊三角形有3條對(duì)稱軸，圓有無(wú)數(shù)條對(duì)稱軸．
故答案為：4；2；3；無(wú)數(shù)．

點(diǎn)評(píng)：此題考查利用軸對(duì)稱圖形的定義確定對(duì)稱軸條數(shù)，要注意識(shí)記常見(jiàn)圖形的對(duì)稱軸條數(shù)．