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Determine the smallest safe cross-sectional areas of members CD, GD, and GF for the truss shown. The working stresses are 140 MPa in tension

Determine the smallest safe cross-sectional areas of members CD, GD, and GF for the truss shown. The working stresses are 140 MPa in tension and 100 MPa in compression. (The working stress in compression is smaller to reduce the danger of buckling.) 6 m B 4 m 6 m H 140 KN 6 m G 6 m D 4 m F 6m 140 KN E

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