Problem

2025 AIME II Problem 6

Circle \omega_1 with radius 6 centered at point A is internally tangent at point B to circle \omega_2 with radius 15. Points C and D lie on \omega_2 such that \overline{BC} is a diameter of \omega_2 and {\overline{BC} \perp \overline{AD}}. The rectangle EFGH is inscribed in \omega_1 such that \overline{EF} \perp \overline{BC}, C is closer to \overline{GH} than to \overline{EF}, and D is closer to \overline{FG} than to \overline{EH}, as shown. Triangles \triangle {DGF} and \triangle {CHG} have equal areas. The area of rectangle EFGH is \frac{m}{n}, where m and n are relatively prime positive integers. Find m+n.

[asy] size(5cm); defaultpen(fontsize(10pt)); pair A = (9, 0), B = (15, 0), C = (-15, 0), D = (9, 12), E = (9+12/sqrt(5), -6/sqrt(5)), F = (9+12/sqrt(5), 6/sqrt(5)), G = (9-12/sqrt(5), 6/sqrt(5)), H = (9-12/sqrt(5), -6/sqrt(5)); filldraw(G--H--C--cycle, lightgray); filldraw(D--G--F--cycle, lightgray); draw(B--C); draw(A--D); draw(E--F--G--H--cycle); draw(circle((0,0), 15)); draw(circle(A, 6)); dot(A); dot(B); dot(C); dot(D); dot(E); dot(F); dot(G); dot(H); label("$A$", A, (.8, -.8)); label("$B$", B, (.8, 0)); label("$C$", C, (-.8, 0)); label("$D$", D, (.4, .8)); label("$E$", E, (.8, -.8)); label("$F$", F, (.8, .8)); label("$G$", G, (-.8, .8)); label("$H$", H, (-.8, -.8)); label("$\omega_1$", (9, -5)); label("$\omega_2$", (-1, -13.5)); [/asy]

Leading zeroes must be inputted, so if your answer is 34, then input 034


Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.


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