A beam of square section $' a'$ is used with its diagonal horizontal. The modulus of section of the beam is given by

- 1
  
  $\frac{a^{4}}{6 \sqrt{2}}$
- 2
  
  $\frac{a^{4}}{12 \sqrt{2}}$
- 3
  
  A3/6 root 2
- 4
  
  $\frac{a^{3}}{12 \sqrt{2}}$

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