设直线pq为y=k(x-2)
om⊥pq
om的斜率=-1/k
设m(x,y)
Kom=y/x
y/x=-1/k
k=-x/y
y=-x/y(x-2)
y²=-x²+2x
x²-2x+1+y²=1
(x-1)²+y²=1