00:01
There's certain formulas you could use for the reference angle.
00:05
What i like to just keep it as simple as possible for the reference angle is it's the positive acute, so smaller than 90 angle made with the x -axis or created with the x -axis.
00:26
So the x -axis is one of the, i guess, rays of the angle.
00:32
The other thing that would be important is to know where 211 degrees is.
00:36
And you start on the positive x -axis, you go counterclockwise, over here is 180 degrees, and then 211 is going to be a little bit further.
00:47
So in my head, i just think about, well, if i want this angle, then what i need to do, whoops, copy that down wrong.
00:55
That was supposed to say 211, right? let me double check.
00:59
Yep.
00:59
So what i would do is go 211 degrees and subtract off 180.
01:05
Now i'm going to use a calculator just to make sure in my head i'm thinking 31.
01:12
And that's what my calculator says.
01:14
So let's move on to the next one, which is 319 degrees.
01:20
This one's different because 319 degrees takes us in the quadrant 4...