Skip to content / Đến nội dung
ThichHocToan.com

2013 AMC 12A Question 11

AMC12 · 2013 AMC 12A

Question 11

Triangle $ABC$ is equilateral with $AB = 1.$ Points $E$ and $G$ are on $\overline{AC}$ and points $D$ and $F$ are on $\overline{AB}$ such that both $\overline{DE}$ and $\overline{FG}$ are parallel to $\overline{BC}.$ Furthermore, triangle $ADE$ and trapezoids $DFGE$ and $FBCG$ all have the same perimeter. What is $DE + FG?$

Question illustration
  1. $1$
  2. $\dfrac{3}{2}$
  3. $\dfrac{21}{13}$
  4. $\dfrac{13}{8}$
  5. $\dfrac{5}{3}$