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Assertion (A): The torsion constant of a thin closed section depends on the square of the enclosed area.

Reason (R): The expression is four times that area squared, over the line integral of ds over t.

Select the correct answer from the options below.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both statements are true and the second states the result the first summarises. The square is what makes closing a section so effective, and it is why enlarging a cell beats thickening its walls whenever the geometry allows.

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