A:②③⑤①
B:④③①⑤
C:④⑥③①
D:⑥③⑤①
如图,△ABC中,AB=AC,∠A为锐角,CD为AB边上的高,点O为△ACD的内切圆圆心,则∠AOB=____ °
如图,在等腰三角形ABC中,AB=AC,DE垂直平分AB,已知∠ADE=40°,则∠DBC=____ °.
–Mr. Wilson, can I ask you some questions about your speech? –Certainly, feel ________to ask me.