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AMO 2022 – Junior College (Grade 11–12) Question 6

AMO · AMO 2022 – Junior College (Grade 11–12)

Question 6

Three circles have centers $A,C,E$ and radius 1. Line $HQ$ is tangent to the circle centered at $A$; $AF$ meets $HC$ at $P$. Point $G$ lies beyond $Q$ on line $HQ$, and $PG=3$. Find $GM$. The figure specifies that $A,C,E$ lie on one another's circles, $F$ is the second intersection of the circles centered at $C,E$, and $M,A,C$ are collinear with $M$ on the circle centered at $A$.

Question illustration
  1. $\sqrt{\frac\pi3-5\sqrt3}$
  2. $\frac\pi2$
  3. $\sqrt{\frac{10}3+2\sqrt3}$
  4. $\sqrt{\frac{40}3-2\sqrt3}$
  5. $\sqrt{\frac{20}3-2\sqrt5}$