如圖,已知AM∥BN,∠A=64°.點(diǎn)P是射線AM上一動(dòng)點(diǎn)(與點(diǎn)A不重合),BC、BD分別平分∠ABP和∠PBN,分別交射線AM于點(diǎn)C,D.
(1)∠ABN的度數(shù)是
116°
116°
,∠CBD的度數(shù)是
58°
58°
;
(2)當(dāng)點(diǎn)P運(yùn)動(dòng)時(shí),∠APB與∠ADB之間的數(shù)量關(guān)系是否隨之發(fā)生變化?若不變化,請(qǐng)寫(xiě)出它們之間的關(guān)系,并說(shuō)明理由;若變化,請(qǐng)寫(xiě)出變化規(guī)律;
(3)當(dāng)點(diǎn)P運(yùn)動(dòng)到使∠ACB=∠ABD時(shí),∠ABC的度數(shù)是多少?