题目在平面直角坐标系xOyxOyxOy中,已知△ABC\triangle ABC△ABC,∠ACB=90∘\angle ACB=90^{\circ}∠ACB=90∘,AC=BCAC=BCAC=BC.(1)(1)(1)如图111,若点A(0,3)A\left(0,3\right)A(0,3),C(1,0)C\left(1,0\right)C(1,0),求点BBB的坐标；(2)(2)(2)如图222,若点A(−1,0)A\left(-1,0\right)A(−1,0),C(1,3)C\left(1,3\right)C(1,3),求点BBB的坐标.知识点：切线的性质章节：图形的性质 / 圆
