- trying to solve for cross-sectional dimensions with only I. Need another equation to form a simultaneous equation.
Main Question or Discussion Point
Hi! I am trying to find the inner (r2) and outer radius (r1) of a hollow circle based on its second moment of area. I have the equation that I=π(r1^4-r2^4)/4. I think I need to use a simultaneous equation and then sub this in for one of the radii. However, I am unsure of another equation I could use. Any suggestions would be great of places to look or things I have overlooked.