SOLUTION: Please help to Write -3R - 7U in polar form

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Please help to Write -3R - 7U in polar form      Log On


   

Question 66328This question is from textbook An Incremental Development
: Please help to
Write -3R - 7U in polar form This question is from textbook An Incremental Development

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Write -3R - 7U in polar form
r=sqrt(3^2+7^2)= 7.616
theta= arctan(-7/-3)= arctan(7/3)=66.80 degrees is the reference angle
But the true angle is in the 3rd quadrant and equals 66.80+180=246.80 degrees
If you want to convert to radians multiply 246.80 by (pi/180)
------------
polar form is 7.616(cos246.80 + isin(246.80)
Cheers,
Stan H.