The cable in Figure P6.2 supports four simply supported girders uniformly loaded with \(6 \mathrm{kips} / \mathrm{ft}\). (a) Determine the minimum required area of the main cable \(A B C D E\) if the allowable stress is \(60 \mathrm{kips} / \mathrm{in} .^{2}\). (b) Determine the cable sag at point \(B\).

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B T 30' fc. tw = 6 kips/ft 4@30=120 E