Physics
posted by Fabricus .
1. Consider four vectors ~F1, ~F2, ~F3, and ~F4, where their magnitudes are F1= 57 N, F2= 38 N, F3= 25 N, and F4= 67 N. Let θ1= 130◦, θ2=−130◦, θ3= 29◦, and θ4=−64◦, measured from the positive x axis
with the counterclockwise angular direction as positive. What is the magnitude of the resultant vector ~F, where ~F=~F1+~F2+~F3+~F4?
Answer in units of N.
2.What is the direction of this resultant vector ~F?
Note:
Give the angle in degrees, use counterclockwise as the positive angular direction, between the limits of −180◦ and +180◦ from the positive x axis.
Answer in units of◦

I showed you how to get the magnitude. Scroll down.
tan theta = sumy/sumx