let 0 be the origin and p be a point on the terminal side of theta, an angle in standard position. find the measure of theta in degrees: p(2, -5). draw the reference triangle, mark theta and alpha
The measure in degrees can be found by using the inverse tangent
We have
tan-1(-5/2) = about - 68.198°.....but this is - 68.198° in the 4th quadrant = about 291.8°
Here's a pic......
