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

Question

mathstudent55 · Answer

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mathstudent55 · Answer

Have you heard of reference angles?

anonymous · Answer

yeahh

mathstudent55 · Answer

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?

anonymous · Answer

45 degrees ?

mathstudent55 · Answer

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.

anonymous · Answer

Alright, thank you for your help!

mathstudent55 · Answer

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