Sin is the opposite over the hypotenuse.
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Sin is sin-1(opposite/hypotonose)
if the triangle has one right angle in it
when you have a right triangle and one of the two non-right angles is theta, sin(theta) is the side of the triangle opposite theta (the side not touching theta) divided by the side that does not touch the right angle
use right triangle trig... sin (angle) = opposite side/hypotunese, cos (angle) = adjacent side/hypotunese, and tan (angle) = opposite side/ adjacent side
If you have a right triangle, the sine of an angle is the ratio of the opposite side to the hypotenuse.