Question

求点(m,n)关于直线kx-y-b=0和Ax+By+C=0的对称点?

Answer 1

联立km+kx-n-y-2b=0 ,(y-n)k/(x-k)=-1 得结果

联立A(x+m)+B(y+n)+2C=0,(y-n)A-(x-k)B=0 得结果