How to find trig values of negative radians using unit circle?

negative pi corresponds to positive pi on the unit circle. Just add whatever negative radian value you have to 2pi and you will get a corresponding angle with identical cos and sin (and tan, etc.) values.

Also, the conversion to go from radians to degrees is

degrees = radians * 180 / pi

so to convert pi / 2 radians to degrees:

degrees = pi/2 * 180 / pi = 90

Hope this helps.

Negative Unit Circle

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RE:

How to find trig values of negative radians using unit circle?

for example: sin of negative pi

thanks in advanced

also if someone could explain how to find the values for degrees using the unit circle, I would appreciate it a lot.

again, thanks

-4/5 is not an angle it's value of cos(angle)=-4/5 if you draw a right triangle with dimensions 3,4,5 then exist an angle which has cos(angle)=4/5 if your triangle has hypotenusa in quadrant 2 then cos(angle)=-4/5