Question 148267: Cos 30 degrees = Sin ??? degrees
Answer by mangopeeler07(462)   (Show Source):
You can put this solution on YOUR website! cos (x)=sin(90-x)
cos (30)=sin (90-30)
cos (30)=sin (60)
Why?
Because cos is adjacent over hypotenuse
and sin is opposite over hypotenuse
If you draw a 30, 60, 90 degree triangle, the adjacent for 30 becomes the opposite for 60. So the cos of 30 would be the sin of 60. So it is the same ratio by a different name.
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