Theory of Structures
Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

Compound beams
Indeterminate beams
Composite beams
Determinate beams

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Theory of Structures
Slenderness ratio of a long column, is

Area of cross-section divided by least radius of gyration
Length of column divided by least radius of gyration
Radius of gyration divided by area of cross-section
Area of cross-section divided by radius of gyration

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