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Thanks!

 Mar 30, 2019
 #1
avatar+6043 
+2

\(\text{Just eyeballing it you've got a regular hexagon with side length equal to}\\ \text{one third the side of the triangle. Let that triangle side length be }s\\ A_t = \dfrac{\sqrt{3}}{4}s^2\\ A_h = \dfrac{3\sqrt{3}}{2}\left(\dfrac{s}{3}\right)^2 = \dfrac{\sqrt{3}}{6}s^2\\ \dfrac{A_h}{A_t} = \dfrac{\frac{\sqrt{3}}{6}}{\frac{\sqrt{3}}{4}}=\dfrac 2 3\)

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 Mar 30, 2019
 #2
avatar+4323 
+2

An easier way is to split the regular hexagon into six equilateral triangles. There are three more in the triangle \(ABC\), so \(\frac{6}{9}=\boxed{\frac{2}{3}}.\)

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 Mar 30, 2019
 #3
avatar+10541 
+1

Here's the picture.

 

laughlaughlaugh

 Mar 31, 2019

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