You are interested in determining how different elements of the cytoskeleton of the cell act together to support loads. You decide to model the cytoskeleton using the principles of a truss (this model is also known as biotensegrity) under loading where the contractile microfilaments and cytoskeletal microtubules are modelled as two-force members. Where the cell attaches to the extracellular matrix, the cellular adhesion sites are modelled by a pin at A and a roller at E. Determine the minimum cross-sectional area required if the normal stress in each cytoskeletal "truss member" must not exceed 0.23 GPa in tension and 0.35GPa in compression given