Reference Angle Chart Page 2

Reference Angle:

The reference angle for any angle

in standard position is the positive acute angle

between the terminal side of

and the x-axis. We will use

(theta prime) to denote a

reference angle. The textbook uses ˆ (theta hat).

Reference angles are pretty easy to “see” when you look at an angle. Find the reference

angle for each of the following angles by drawing the angle and looking (with a little

arithmetic).

125

235

335

There are formulas for how to find reference angles. We’ll write them down, but you’re

much better off just understanding.

Quadrant I:

Quadrant II:

Quadrant III:

Quadrant IV:

Again, you can use these formulas, but you don’t really need them if you understand

what a reference angle is…just think about the picture!

0 votes

Parent category: Education