Collinear points, points that are on the same line, Non-collinear, points that are not on the same line, vertical angles, angles formed by the intersection of two lines. opposite angles, mirror angles, supplementary angles, two angles that add up to 180 degrees, complementary angles, two angles that add up to 90 degrees, angle bisector, a ray than cuts an angle into two equal angles, midpoint, a point that is in the middle of a segment, alternate interior angles, equal, alternate exterior angles, equal, corresponding angles, equal - top to top or bottom to bottom matching angles, Ray, an infinite collection of points in one direction. Has a starting point but no end. , Segment, Has a starting point and ending point. Can be measured, Line, an infinite collection of points in two directions. , Angle, the intersection of two rays. Measure in degrees, How to name an angle, you must use 3 points with the vertex in the middle, acute angle, less than 90 degrees, obtuse angle, more than 90 degrees, right angle, 90 degree angle, congruent, same or equal.

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