Corners of a square or triangle cut off to form a regular octagon or hexagon

1. A.
   $a (\sqrt{2} - 1)$
2. B.
   $a (\sqrt{3} - 1)$
3. C.
   $\frac{a}{\sqrt{2} + 2}$
4. D.
   $\frac{a}{3}$

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1. A.
   2 : 1
2. B.
   3 : 2
3. C.
   4 : 3
4. D.
   5 : 3

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1. A.
   1.00 cm
2. B.
   1.64 cm
3. C.
   1.68 cm
4. D.
   1.72 cm

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