Grade 9-11 only

Geometry Level 4

Let A B C ABC be an acute-angled triangle with incircle ω \omega and incenter I I . Let ω \omega touch A B , B C AB, BC and C A CA at points D , E , F D, E, F respectively. The circles ω 1 {\omega}_1 and ω 2 {\omega}_2 centered at J 1 J_1 and J 2 J_2 respectively are inscribed into A D I F ADIF and B D I E BDIE . Let J 1 J 2 J_1J_2 intersect A B AB at point M M . Let C D CD intersects I M IM in X X .

Find I X D \angle IXD in degrees.


The answer is 90.

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