假设两人相遇在C点对△ABC,根据正弦定理BC/sin∠CAB = AC/sin∠ABCBC=bt,sin∠CAB = y/x,AC=at所以sin∠ABC = AC * sin∠CAB / BC = ay/bx∠1 = arcsin(ay/bx)多想一点的话还要考虑到一种情况,当(180°-arcsin(y/x))/2 < ∠1 <90°时,从B点出发的人有两种出发方向均可恰好追到A点出发的人。两个角度分别是arcsin(ay/bx)和180°-arcsin(ay/bx)