To find the measure of the angles, we know that the sum of all the angles is 1260 degrees (from above). And there are nine angles.
So, the measure of the angle of a regular nonagon is 140 degrees.
[Triangle] Determine the measure of each interior angle of △MAN and classify the triangle.\(\triangle MAN\) is a(n)_______________ triangle.
In any triangle ABC, E and D are interior points of AC and BC,respectively. AF bisects angle CAD and BF bisects angle CBE. Prove that measures (AEB) + measure (ADB) = 2x measure of (AFB).