Answer: Choice B. [tex]\frac{\sqrt{3}}{2}[/tex]
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Reason:
Sine is the ratio of opposite over hypotenuse
[tex]\text{sine} = \frac{\text{opposite}}{\text{hypotenuse}}[/tex]
The side opposite the 60 degree angle is [tex]\sqrt{3}[/tex] units long, and the hypotenuse is 2 units long.
