simplification of expression to get value

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I need help in solving this question. how can get the value for degree?

equation: 
x = 9.8 * sin( degree * ( PI /180) )

where i know the value of degree

suppose 
degree = 50
x = 9.8 * sin( 50 * ( 3.14 /180) )
x = 7.51

now from the value of X i need to reverse and find the value for degree

where x = 7.51
7.51 = 9.8 * sin(degree * (3.14/180))
expected answer = 50

what i expect is degree = 50 but i don't know how to simplify the formula and value evolution.

i also don't know even its possible or not so please if not possible then downgrade the question so i delete it