Alicia's Blog topic

okay so im going to explain the 3rd topic, how to find a reference angle.

Finding a reference angle is used when the angle does not appear on the trig chart or unit circle.

First, set up your blanks before and after your trig function
Example: ____SIN_____

The first blank is where you put positive or negative depending on the trig functions quadrant
The second blank is where you put the reference angle you find

The point of the reference angle is to get your angle that you are given between 0 and 90 degrees.

When finding reference angles, you can either add or subtract 360 and 180 to your angle depending on how big or small the number is.

The final number that you get should be between 0 and 90 degrees. This is the number that goes in the second blank

To determine positive or negative, you have to know your trig functions quadrants.
Example: SIN is positive is quadrant I & II. Negative in III & IV

Hope this helped!!!
Goodluck on the trig exam.
If anyone wants to make a study group I would like to be in it :)