Notice the picture below
x = 1 and y = -1
now... recall your SOH CAH TOA

now.. what's the value for "r" or the radius? well, using the pythagorean theorem
I have to make twenty characters, but the answer is 1/n
5=(-4)x-2. Hope this helps
The square roo it 7.07106781 i
Upward motion
Hope that helps