Posted by Cindy on Wednesday, December 14, 2011 at 9:35pm.
sides of standard 30-60-90 triangle are 1 , √3, 2
so the larger triangle has sides 6, 6√3 and 12
(multiplied by a factor of 6)
perimeter = 6 + 6√3 + 12 = 18 + 6√3
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