Design of Steel Structure
For a compression member with double angle section, which of the following section will give larger value of minimum radius of gyration?

unqual legged angles with long legs back to back
both (b) or (c)
equal angles back to back
unequal legged angles with short legs back to back

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Design of Steel Structure
The mechanism method and the statical method give

upper and lower bounds respectively on the strength of structure
lower and upper bounds respectively on the strength of structure
upper bound on the strength of structure
lower bound on the strength of structure

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