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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