题目内容
如图,△ABC绕它的顶点C顺时针旋转45°,得到△A1BlC,若∠A1 CB=30°,
则∠ACB= .
75°;
如图,△ABC绕它的顶点C顺时针旋转45°,得到△A1BlC,若∠A1 CB=30°,则∠ACB= .