The value of sin 30 is 1/2.
The 30 60 90 triangle is shown below:
The ratio sin is opposite over hypotenuse.
With respect to the angle 30, we see that:
The opposite side is x
The hypotenuse is 2x
Thus, we can write:
[tex]\sin 30=\frac{x}{2x}[/tex]
Cancelling out the x's, we have:
[tex]\sin 30=\frac{1}{2}[/tex]
Thus, the correct answer is D
