(a) Show that $\displaystyle C^2=(2x^3)/(2x-8.5)$

(b) Find the domain of C.

(c) Determine the x-value that minimizes C.

(d) Determine the minimum length of C.

I am unsure on how to approach this problem.... it would seem that I would need more angle information. It seems I could solve the left region of the polygon, but I have no idea what to do with the right-hand portion.