SOLUTION: How do I convert the rectangular coordinates (2, -2) to polar coordinates?

Algebra ->  Trigonometry-basics -> SOLUTION: How do I convert the rectangular coordinates (2, -2) to polar coordinates?      Log On


   

Question 454101: How do I convert the rectangular coordinates (2, -2) to polar coordinates?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
How do I convert the rectangular coordinates (2, -2) to polar coordinates?
..
x= r cos A
y= r sin A
r^2=x^2+y^2
tan A =y/x
..
r^2=2^2+(-2)^2=8
r=2√2
tan A=-2/2=-1
A=135º or 3π/4
ans:
polar coordinates (2√2,3π/4)