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2015-11-23T20:33:56+05:30

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area of a regular hexagon = 3√3 a² / 2
= 3√3 * 8 * 8 / 2 
= 3√3 * 32 
= 96√3 
therefore the answer is 96√3 cm² .
      i hope it helps.........................^_^
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2015-11-23T20:52:36+05:30
If we join the diagonals of a regular hexagon, we get six equilateral triangles with length of each side 8 cm.

So, Area of regular hexagon=6* Area of 1 equilateral triangle
                                             =6 * √3/4 * 8²
                                             = 6 * √3/4 * 64
                                             =  6 * √3 * 16
                                             = 48√3 cm²
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Sorry, I committed a mistake.
16*6=96 and not 48
So answer is 
96(root)3 cm^2