Question

How can you find the coordinates of the point at which the terminal side of -225 degrees intersects the unit circle ?

Answer 1

Have you heard of reference angles?

Answer 2

yeahh

Answer 3

I drew a 225-deg angle. You see the terminal side in the 3rd quadrant. What is the reference angle for that 225-deg angle?

Answer 4

45 degrees ?

Answer 5

Yes.
Now draw a 45-deg angle in standard position.
also, draw a unit circle.
The radius of the unit circle is 1.
The cosine and sine of the 45-deg angle have the same absolute value as the x- and y-coordinates of the 225 degree angle's intersection with the unit circle.

Answer 6

Alright, thank you for your help!