如圖所示，兩三角形關(guān)于直線l成軸對(duì)稱，根據(jù)圖上數(shù)據(jù)，可得∠α的度數(shù)為________．

如圖所示，直線MN是線段AB的對(duì)稱軸，點(diǎn)C在MN外，CA與MN相交于點(diǎn)D，如果CA＋CB＝4 cm，△BCD的周長(zhǎng)等于________cm．

如圖所示，已知△ABC與△EFG關(guān)于直線l對(duì)稱，且AB＝6 cm，BC＝3 cm，CA＝4 cm，那么FG＝________cm，EG＝________cm．

如圖所示，OE平分∠AOB，BD⊥OA，AC⊥BO，則關(guān)于直線OE對(duì)稱的三角形有________對(duì)．

畫出點(diǎn)A關(guān)于直線l的對(duì)應(yīng)點(diǎn)可采用如下方法：過點(diǎn)A作對(duì)稱軸l的________，垂足為B，延長(zhǎng)________至，使得________＝________，點(diǎn)就是點(diǎn)A關(guān)于l的對(duì)應(yīng)點(diǎn)．

觀察下列符號(hào)中所蘊(yùn)含的規(guī)律，并填入適當(dāng)?shù)姆��?hào)．

、、________、、

如圖所示的圖形都可看成是軸對(duì)稱圖形，其中只有一條對(duì)稱軸的是________；有2條對(duì)稱軸的是________；有4條對(duì)稱軸的是________(都只要求寫圖形序號(hào))．

如果兩個(gè)圖形關(guān)于某條直線或軸對(duì)稱，那么對(duì)應(yīng)點(diǎn)所連的線段被對(duì)稱軸________，且對(duì)應(yīng)線段________，對(duì)應(yīng)角________．

請(qǐng)寫出數(shù)字0～9中是軸對(duì)稱圖形的數(shù)字有________．

長(zhǎng)方形是軸對(duì)稱圖形，它有________條對(duì)稱軸；圓是軸對(duì)稱圖形，它有________條對(duì)稱軸；線段有________條對(duì)稱軸．