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Because the elevation of the inscribed triangle (to the unit circle) is still positive.

I also noticed that.

|dw:1348381225832:dw|

but why "180 - angle", not "angle - 180"

Well, in the given example. If angle = 45, then 45 - 180 = -90. sin(-90) is not equal to sin(45)

It would have the same *magnitude* but not the same *sign*.

ohh ok thanks :)

np.

ok, thanks again :)

np.