1. The problem statement, all variables and given/known data Problem that was gone over in class, but I missed part of the lecture Describe all points (x,y) satisfying | p - s | + | p - t | = Q where, Vector p = <x,y> Vector s = <a,b> Vector t = <c,d> a,b,c,d and Q are constants and Q is greater than | s - t | 3. The attempt at a solution I think the graph is a cylinder, but I am having a lot of trouble trying to verify or describe that. Ive tried writing in the components and brute forcing it, but it ends up quite hairy. I also have tried squaring both sides and using the fact that if u and v are vectors then | u + v | ^2 = |u|^2 + |v|^2 But I haven't made much progress there either. Is there some identity or simplification I am not seeing?