It doesn't matter if it is force or velocity, the vectors can still be added together the same way. A swan is flying due west with a velocity of \(20\,m\,s^{-1}\) and then meets a crosswind of \(8 ...

Vectors are equal if they have the same magnitude and direction regardless of where they are. Triangle ABC is isosceles. X is the midpoint of AB, Y is the midpoint of BC and Z is the midpoint of AC.