Length and breadth of a rectangle are 8 ...

Length and breadth of a rectangle are 8 cm and 6 cm respectively. The rectangle is cut on its four vertices such that the resulting figure is a regular octagon. What is the side (in cm) of the octagon?

A

`3(sqrt11)-7`

B

`5(sqrt13)-8`

C

`4(sqrt7)-11`

D

`6(sqrt11)-9`

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