如图,已知AB=A1B,A1C=A1A2,A2D=A2A3,A3E=A3A4,∠B=20°,则∠A4=( )A...
问题详情:如图,已知AB=A1B,A1C=A1A2,A2D=A2A3,A3E=A3A4,∠B=20°,则∠A4=( )A.10° B.15° C.30° D.40°【回答】A知识点:等腰三角形题型:选择题...
问题详情:如图,已知AB=A1B,A1C=A1A2,A2D=A2A3,A3E=A3A4,∠B=20°,则∠A4=( )A.10° B.15° C.30° D.40°【回答】A知识点:等腰三角形题型:选择题...