Question

In rectangle ABCD, if the coordinates of A are (0, 0) and of C are (r, s), find the coordinates of B.

Answer 1

you have coordinate of (0,0) for A, the x of coordinate B is the same as A
so you know it is (0, ), now need to find the y coordinate
you have that coordinate of C = (r,s), coordinate of B is the same y of C
so it is (0,s)