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Omni-MATH / Let ABCD be a convex trapezoid such that ∠ABC=∠BCD=90^(∘),AB=3,BC=6, and CD=12. Among all points X inside the trapezoid satisfying ∠XBC=∠XDA, compute the minimum possible value of …

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Let ABCDA B C D be a convex trapezoid such that ∠ABC=∠BCD=90∘,AB=3,BC=6\angle A B C=\angle B C D=90^{\circ}, A B=3, B C=6, and CD=12C D=12. Among all points XX inside the trapezoid satisfying ∠XBC=∠XDA\angle X B C=\angle X D A, compute the minimum possible value of CXC X.
Plain-text mathematical notation (without MathML)
Let ABCD be a convex trapezoid such that ∠ABC=∠BCD=90^(∘),AB=3,BC=6, and CD=12. Among all points X inside the trapezoid satisfying ∠XBC=∠XDA, compute the minimum possible value of CX.
Original LaTeX notation
Let $A B C D$ be a convex trapezoid such that $\angle A B C=\angle B C D=90^{\circ}, A B=3, B C=6$, and $C D=12$. Among all points $X$ inside the trapezoid satisfying $\angle X B C=\angle X D A$, compute the minimum possible value of $C X$.

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