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April 19, 2015

April 19, 2015

Posted by **damon** on Tuesday, December 13, 2011 at 1:12pm.

- geometry -
**Reiny**, Tuesday, December 13, 2011 at 1:45pmlet x be the base of one of those triangles.

cos 60° = x/(18√3)

x = 18√3 cos 60°

= 18√3(√3/2) = 9

but x would be 1/2 of one of the sides of the hexagon

so each side is 18

and the perimeter = 6(18) or 108

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