polar rectangular conversions

Thread Starter

gcp

Joined Jan 25, 2009
6
Im trying to revive my memory, its been awhile since I had to work with polar and rectangular. I want to add -1@210 deg plus 0@210deg. I converted to rectang and got .866+j.5. when going back to polar I end up with 5@30deg? What am I missing here? I was doing fine working nums up thru 180deg, but after that I am missing something here.
 

hgmjr

Joined Jan 28, 2005
9,029
I think you should have gotten the answer 1@30. The sign of the magnitude has changed from negative to positive and the angle has been decreased by 180 degrees. The change in angle offsets the change in sign.

-1@210 equals 1@30

hgmjr
 

Thread Starter

gcp

Joined Jan 25, 2009
6
Thanks for the help...I thought adding 180 back in had something to do there but I couldnt remember gettting the 1 to neg 1. Heres another that has me stumped. Im adding -.68@200and .69@200 I get 0@0? why the )deg?
 
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