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Area=r^2/2*(∏/180*C-sin(C))

where r is the circle's radius and C is the central angle of the associated sector.

In this particular case, I have a predetermined area and need to determine the central angle. How do I solve for C?

In it's most basic form, I have:

y=x+sin(x)

Solve for x.

Any help is appreciated. Thanks!