The sine function is one of the three primary trigonometric functions. In a right triangle, sine is the ratio of the length of the side opposite to the angle and length of the hypotenuse.
sinθ = OppositeHypotenuse
Special values of sine
Notice the pattern
Explore by rotating the hypotenuse about the circle's center. By calculating the ratio opposite/hypotenuse for different values of θ, you can construct the graph of sinθ. Change the value of r with the slider and notice that this ratio is not affected.
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