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MathNet 2021 — Part 10 Question 75

Math Olympiad Vault · MathNet 2021 — Part 10

Question 75

Point $G$ lies on side $AB$ of square $ABCD$ and square $AEFG$ is drawn outwards $ABCD$, as shown in the figure below. Suppose that the area of triangle $EGC$ is $1/16$ of the area of pentagon $DEFBC$. What is the ratio of the areas of $AEFG$ and $ABCD$?
Question illustration
  1. $4:25$
  2. $9:49$
  3. $16:81$
  4. $25:121$