physics
posted by james .
A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction รจ of the resultant vector

You have made this problem impossible by the most fundamental error.
You gave us scalars, not vectors!
Vectors have both magnitude (scalar length) and DIRECTION !!!
Without direction, the three "things" are simply not vectors and they certainly do not have components.