Bonus problem: Parallelogram on the coordinate plane
You are graphing quadrilateral ABCD in the coordinate plane. The length of segment AB is the same as the length of segment DC, and both segments are horizontal. The following are three vertices of the quadrilateral: A(1,1), C(4.5,4), and D(−1.5,4). All you know about point B is that it is in the first quadrant.