Angle: the aperture in grades of a compass
Vertex : the point where the two lines of an angle encounters
Interior of an angle: Is the arc of a circunference that is inside the two lines of the angle
Exterior of an angle: the arc of a circunference centered in the vertex that is outside the two lines of the angle
Protactor postulates says that theres only one number for every angle
Acute angle : one that is less than 90degrees
Obtuse angle :angles is more than 90 degrees
Straight angle: the angle is exactly 90 degrees
Congruent angles : two angles that havevthe same value
Angle adition postulate: given an angle ABC is always posible to split the angle in two angles