题目如图,ABABAB为⊙O\odot O⊙O的切线,点AAA为切点,OBOBOB交⊙O\odot O⊙O于点CCC,点DDD在⊙O\odot O⊙O上,连接ADADAD、CDCDCD、OAOAOA,若∠ADC=35∘\angle ADC=35^{\circ}∠ADC=35∘,则∠ABO\angle ABO∠ABO的度数为____.知识点：垂径定理章节：图形的性质 / 圆
如图,为的切线,点为切点,交于点,点在上,连接、、,若,则的度数为____.如图,为的切线,点为切点,交于点,点在上,连接、、,若,则的度数为____.如图,为的切线,点为切点,交于点,点在上,连接、、,若,则的度数为____.