Vector A=(oi +3j), B=(8i-1j), C=(-8i+5j)
Find the angle from the positive x-axis of the vector A+B+C
Find the magnitude and direction of the vector -A-B+C
The Attempt at a Solution
I know that the answer is 90, but I'm not sure how to get that. I know that theta=tan-1(y/x) and that doesn't equal 90.
As far as the second part, this is what I did:
square root (0-8-8)^2+(-3+1+5)^2 and that supposed to be equal to 16.28, but it's not. Would I use tangent to find the angle?
Could someone please show me how to do this?
Thank you very much