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"C) Conclude that a round solid fiber gives
minimal stiffness for a given strength."
If "a given strength", is the same as a given cross sectional area, then
not true. Aux contraire, a cylinder has the highest stiffness strength
(tensile) for a solid member than any other simply connected
cross-sectional shape. St. Venant showed this some time ago (ca.
1855). continuing: