For the slant-legged rigid frame shown in Figure P5-21, size the structure for minimum weight based on a maximum bending stress of 20 ksi in the horizontal beam elements and a maximum compressive stress (due to bending and direct axial load) of 15 ksi in the slant-legged elements. Use the same element size for the two slantlegged elements and the same element size for the two 10-foot sections of the horizontal element. Assume A36 steel is used.

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4000 lb 16,000 lb 16,000 Ib 11 ft -10 ft 6) 10 ft -14 ft 3) 13 25 ft 5) 15 ft