Square ABCD with side length 4, where point a is at the origin, point B is at the positive half axis of X axis, and point D is at the negative half axis of Y axis, what are the coordinates of the four vertices? Such as the title

Square ABCD with side length 4, where point a is at the origin, point B is at the positive half axis of X axis, and point D is at the negative half axis of Y axis, what are the coordinates of the four vertices? Such as the title

A(0,0)
B(4,0)
C(4,-4)
D(0,-4)
Just draw a picture