There are two points a (1,7) and B (3,4) in the plane rectangular coordinate system. How to find a point C and D on the x-axis and y-axis to minimize the perimeter of the quadrilateral ABCD?

There are two points a (1,7) and B (3,4) in the plane rectangular coordinate system. How to find a point C and D on the x-axis and y-axis to minimize the perimeter of the quadrilateral ABCD?

Let a '(- 1,7) B' (3, - 4) connect a'B 'with C on the x-axis and D on the y-axis
It is proved that BC = b'c ad = a'd
Perimeter of quadrilateral ABCD = AB + BC + CD + Da = AB + b'c + CD + Da '
AB is a fixed value, b'c + CD + da'the minimum is as long as a'B '