"The r is normally limited to non-negative numbers, but negative r is sometimes used to represent a point at an angle pi apart from the theta specified."
from polar coordinates@Everything2.com
I have just been informed (and been able to verify on the web) that the polar coordinate system allows the use of r < 0.
I was never taught that. When did this convention start being used? Did my teachers simply not happen to use it?
-Dan
"The r is normally limited to non-negative numbers, but negative r is sometimes used to represent a point at an angle pi apart from the theta specified."
from polar coordinates@Everything2.com