Midpoint Formula. Using a Protractor. Measuring Angles. Measuring Angles in Degrees. Angle Basics. Complementary and Supplementary Angles. Identifying Complementary and Supplementary Angles. Angles (part 2) Acute Right and Obtuse Angles. Acute Obtuse and Right Angles. Language and Notation of Basic Geometry. Introduction to Euclidean geometry. Introduction to Euclidean geometry.