1992 OIM Problems/Problem 6

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Problem

From the triangle $T$ with vertices $A$, $B$ and $C$, the hexagon $H$ with vertices $A_1$, $A_2$, $B_1$, $B_2$, $C_1$, $C_2$ is constructed as shown in the figure.

Show that:

\[area(H) \ge 13.area(T)\]

Ibe7 2.gif

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

  • Note. I actually competed at this event in Venezuela when I was in High School representing Puerto Rico. I think I got half the points on this one. I don't remember what I did. I will try to solve later.

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See also

https://www.oma.org.ar/enunciados/ibe7.htm