The core of a rectangular section with sides b and d is a

- 1
  
  square with side $\frac{\sqrt{b^{2} + d^{2}}}{6}$
- 2
  
  rhombus with side $\frac{\sqrt{b^{2} + d^{2}}}{6}$
- 3
  
  rectangle with sides $b / 3$ and $d / 3$
- 4
  
  parallelogram with sides $\frac{b}{6 \sqrt{2}}$ and $\frac{d}{6 \sqrt{2}}$

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