This document defines and describes various types of angles found in nature. It discusses acute angles that are less than 90 degrees, right angles that are exactly 90 degrees, and obtuse angles that are greater than 90 degrees. It also defines complementary angles whose sums are 90 degrees, supplementary angles whose sums are 180 degrees, and vertical angles formed by two intersecting lines. Bisected, linear pairs, and opposite rays of angles are also described.