Knowing that sin 30= 1/2, what is a?

The value of a in the triangle is 10
The sine of an angle is:
sin(angle)= opposite/hypotenuse
Using the question parameters, we have:
sin(30) = 5/a
Substitute sin(30) = 1/2
1/2 = 5/a
Cross multiply
a = 2 * 5
Evaluate
a = 10
Hence, the value of a in the triangle is 10
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