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