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AIME 2016a Problem 15

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Circles ω1\omega_1 and ω2\omega_2 intersect at points XX and YY. Line ℓ\ell is tangent to ω1\omega_1 and ω2\omega_2 at AA and BB, respectively, with line ABAB closer to point XX than to YY. Circle ω\omega passes through AA and BB intersecting ω1\omega_1 again at D≠AD \neq A and intersecting ω2\omega_2 again at C≠BC \neq B. The three points CC, YY, DD are collinear, XC=67XC = 67, XY=47XY = 47, and XD=37XD = 37. Find AB2AB^2.

Dataset text AIME 1983 to 2026. Quoted with source.

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