如图,在△ABC中,∠ACB=2∠ABC,求证:2AC>AB.
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如图,在△ABC中,∠ACB=2∠ABC,求证:2AC>AB.
如图,在△ABC中,∠ACB=2∠ABC,求证:2AC>AB.
如图,在△ABC中,∠ACB=2∠ABC,求证:2AC>AB.
延长BC到D,使CD=AC,连接AD
∴∠CAD=∠D
∵ ∠ACB=∠CAD+∠D
∴∠ACB=2∠D
∵∠ACB=2∠ABC
∴∠B=∠D
∴AB=AD
∵AC+CD>AD
∴2AC>AB