Answer:
30.1°
Explanation:
You want the acute angle whose sine is 0.5015.
Inverse sine
When you know the sine of an angle and want to find the angle, you use the inverse sine, or arcsine, function.
sin(x) = 0.5015
x = arcsin(0.5015) ≈ 30.1°
The value of x is about 30.1 degrees.
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Additional comment
There are an infinite number of angles that have that sine value. Only one of them is a positive angle less than 90°. Be sure your calculator is in degrees mode, if you don't want units of radians or grads. (Spreadsheet functions will give an answer in radians.)
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