AMC 12 2025b Problem 25

Three concentric circles have radii $1,2,3$. An equilateral triangle with side length $s$ has one vertex on each circle. What is $s^2?$

$\textbf{(A) } 6 \textbf{(B) } \frac{25}{4} \textbf{(C) } \frac{13}{2} \textbf{(D) } \frac{27}{4} \textbf{(E) } 7$