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MathNet 2025 — 50 problems with figures (EN–VI) Question 30

Math Olympiad Vault · MathNet 2025 — 50 problems with figures (EN–VI)

Question 30

Circles $\omega_1$ and $\omega_2$ touch at point $K$. The line through the centres of the circles intersects the circle $\omega_1$ once more at point $A$. A line through the point $A$ intersects the circle $\omega_1$ once more at point $B$ and the circle $\omega_2$ at points $C$ and $D$, where the points $A, B, C, D$ lie on the line in the order. Given that the line segments $AB$, $BC$ and $CD$ have equal lengths, find the ratio of the radii of the circles $\omega_1$ and $\omega_2$.