Using a semi circle to determine the measure of a minor arc

The video tutorial explains how to measure a minor arc, specifically Arc AB, which is less than 180 degrees. It discusses the concept of intersecting lines and vertical angles, emphasizing the congruence of opposite angles. The tutorial also covers calculating angles in a circle, using the diameter to determine semicircles and subtracting known angles to find unknown ones.

What new insight or understanding did you gain from this video?