题目点PPP为⊙O\odot O⊙O外一点,PAPAPA,PBPBPB分别与⊙O\odot O⊙O相切于点AAA,BBB,点CCC为⊙O\odot O⊙O上不与AAA,BBB重合的点,若∠P=80∘\angle P=80^{\circ}∠P=80∘,则∠ACB\angle ACB∠ACB的度数是______.知识点：切线长定理章节：图形的性质 / 圆
