Problem 3-9 - Vector sum - (c)

Find the magnitude and direction of the sum of the vectors \(A + B + C\) using the component technique. Assume two significant digits.
\(A = 20\; km\) north, \(B = 30\; km\) east, \(C = 50\; km\; 55 ^\circ\) west of north.

This is certainly permissible but is counter-intuitive for people living in the northern hemisphere. We usually think of \(\text{N} \rightarrow y\) and \(\text{E}\) is to the right, i.e., \(x\).