The x-axis is horizontal, positive to the right.
The y-axis is vertical, positive up.
Angles are measured counter-clockwise from the positive x-axis.
The resultant, shown in green, goes from the tail of the red vector to the tip of the blue vector - it is the sum of the red and blue vectors.
Here are a few things to try:
Created by Andrew Duffy, Boston University Physics Department.
Last update September 1, 1998