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The radius of gyration of a section is

  • A.The area over the second moment of area
  • B.The square root of the area
  • C.Root of second moment over area
  • D.The second moment of area over the area

Answer: C

It expresses how far the material effectively lies from the neutral axis and has units of length. A section with a large radius of gyration for its area is efficient in compression, which is why tubes and wide-flanged sections are favoured for struts.

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