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A regular octagon is formed by cutting a...

A regular octagon is formed by cutting an isosceles right triangle from each of the corners of a square with side 15 cm. The area (in `cm^2` ) of the octagon is

A

`15(2sqrt2 - 1)`

B

`(15)^2 (2 sqrt2 - 1)`

C

`15(2sqrt2 - 2)`

D

`(15)^2 (2sqrt2 -2 )`

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