What's the angle of this vector: v = -2i - 8j?
I tried the tangent of -2/-8 but I get 14 degrees. It's wrong! :(

Question

What's the angle of this vector: v = -2i - 8j?
I tried the tangent of -2/-8 but I get 14 degrees. It's wrong! :(

phi · Answer

isn't it atan(y/x) .  I assume  i  is x  and j is y, so you want atan(-8/-2)

anonymous · Answer

You are right! I meant arctan, I was doing arctan(-2/-8) instead of (-8/-2).

Thanks ! Haha, I guess i've been studying too much in such little time. :) 
Medal!

phi · Answer

also, you would be in the 3rd quadrant.  so it would be 180 degrees + 76 (rounded)

anonymous · Answer

Makes sense! because the negatives cancel out, right?