I have a sketch consisting of a line, an arc, an arc, and another line. I want to constrain the total amount of material used to a certain value. I'm not sure how to dimension the line + curve + curve + line. A picture is attached.

I have a sketch consisting of a line, an arc, an arc, and another line. I want to constrain the total amount of material used to a certain value. I'm not sure how to dimension the line + curve + curve + line. A picture is attached.

You can dimension and constrain the circumference of those curves and add that dimension to your "line + line + curve + curve" equation.

Start by selecting one end point, then the next end point to the arc, then the arc itself, and finally select the location to place the dimension.

You then can treat it as any other dimension with an equation, or etc.

FYI, SW 2014 has a path length dimension in the dimensions toolbar. Would that be helpful?