To find the measure of angle ∠11, I need more information about the relationships between the angles shown in the figure. Angles can be related through various theorems, such as the sum of angles in a triangle, vertical angles, or supplementary angles (angles that add up to 180 degrees).
If you have any information about the angles in the figure, such as whether they are complementary, supplementary, or if you can provide the measures of any other angles, please share that information so I can help you determine the measure of angle ∠11.