Three vectors a, b and c are each 50m long and lie in the x-y place. Their directions relative to the positive x axis are 30 degree, 195 degree and 315 degree respectively. what are the magnitude and angle of a + b + c, and of a - b + c. What are the magnitude and angle of a fourth vector d such that (a + b) - (c + d) = 0.
I took the angle between the two vectors a and b as 195 - 30 = 165 and tried to apply parallelogram law of addition for a and b. and c could be added to a + b.
Is the method correct? The problem is I am not able to do anything with the angle 165 degree.
How to do this problem. Any help?