I'm working to calculate the cross-sectional area of a lathe turned feature machined with a radiused insert. My calculations have essentially led me to the equation for the area of a segment of a circle. 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!