Cracking the SAT Physics Subject Test

B + C = A

Since we are working with two dimensions, it is usually easiest to choose
component vectors that lie along the x- and y-axes of the rectangular coordinate
system, also known as the Cartesian coordinate system. The three arrows of the
known vector and its component vectors create a right triangle. Setting up the
components of the vectors in this way makes it much easier to add and subtract
vectors, and it allows you to use the Pythagorean theorem instead of some tricky
trig.