如圖,D在BC邊上,△ABC≌△ADE,∠EAC=40°,則∠B的度數爲 .
問題詳情:如圖,D在BC邊上,△ABC≌△ADE,∠EAC=40°,則∠B的度數爲 .【回答】70°.解:∵△ABC≌△ADE,∴AB=AD,∠BAC=∠DAF,∴∠BAC﹣∠DAC=∠DAF﹣∠DAC,∴∠BAD=∠∠EAC,∵∠EAC=40°,∴∠BAD=40°,∵AB=AD,∴∠B=∠ADB=(180°﹣∠BAD)=70...
問題詳情:如圖,D在BC邊上,△ABC≌△ADE,∠EAC=40°,則∠B的度數爲 .【回答】70°.解:∵△ABC≌△ADE,∴AB=AD,∠BAC=∠DAF,∴∠BAC﹣∠DAC=∠DAF﹣∠DAC,∴∠BAD=∠∠EAC,∵∠EAC=40°,∴∠BAD=40°,∵AB=AD,∴∠B=∠ADB=(180°﹣∠BAD)=70...