What is the angle (in standard position - i.e. measured counterclockwise from the positive x-axis) formed by a line from the origin to point (1,-2)?

Please help and Thank you

2 answers

tanAr = Y/X = -2/1 = -2.
Ar = -63.43 Deg., CW. Q4.
A = -63.43 + 360 = 297 Deg., CCW.
post.