如图,D在BC边上,△ABC≌△ADE,∠EAC=40°,则∠B的度数为 .
问题详情:如图,D在BC边上,△ABC≌△ADE,∠EAC=40°,则∠B的度数为 .【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...
问题详情:如图,D在BC边上,△ABC≌△ADE,∠EAC=40°,则∠B的度数为 .【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...