谁能帮忙翻译一下 Germany Team Selection Tests 2006
谁能帮忙翻译一下
Let A1, B1, C1 be the feet of the altitudes of an acute-angled triangle ABC issuing from the
vertices A, B, C, respectively. Let K and M be points on the segments A1C1 and B1C1,
respectively, such that∠KAM = ∠A1AC. Prove that the line AK is the angle bisector of
the angle C1KM.