Final answer:
The Same-side Exterior Angles Theorem (SSEA Theorem) is a geometric principle that explains the relationship between two exterior angles on the same side of the transversal which sum to 180 degrees, typically taught in high school geometry.
Step-by-step explanation:
The Same-side Exterior Angles Theorem (SSEA Theorem) is C) A geometric principle. This principle involves the relationship between two angles formed when parallel lines are cut by a transversal. In particular, same-side exterior angles are found on the same side of the transversal and outside the parallel lines, and according to the theorem, they are supplementary, meaning they add up to 180 degrees. Understanding this concept is crucial for solving various geometry problems and is often taught in high school mathematics classes.