Theory of Structures
An isolated load W is acting at a distance a from the left hand support, of a three hinged arch of span 2l and rise h hinged at the crown, the horizontal reaction at the support, is

Wa/h
2W/ha
Wa/2h
2h/Wa

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Theory of Structures
Slenderness ratio of a long column, is

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

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