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Chapter 1 Vocabulary Fill in the blanks using your textbook. Copy the examples from the board during class. Term Definition & Notation * thought of as a 1 Point 2 Space with no size Notation: set of all * thought of as a series of that extend in two opposite directions without end 3 Line Notation: 4 Collinear points points that lie on the same 5 Plane * thought of as a flat with no thickness that extends without end Notation: 6 7 Coplanar Segment figures in the same part of a line consisting of and all points between them Notation: endpoints Example 8 Ray part of a line consisting of endpoint and all points of the line on one side of the endpoint Notation: 9 Opposite rays two endpoint rays with the same Notation: lines that do not intersect 10 Parallel lines Symbols: 11 Skew lines lines (not parallel and do not intersect) 12 Parallel planes planes that do not 13 Congruent segments segments with the same Symbols: the point on a line segment that divides it 14 Midpoint into two Notation: segments figure formed by two rays with the same (called the vertex). The sides are rays. 15 Angle Notation: an angle whose measure is between 16 Acute angle 17 Right angle 18 Obtuse angle 19 Straight angle an angle whose measure is 20 Congruent angles angles with the same an angle whose measure is an angle whose measure is between 21 Perpendicular two lines that intersect to form angles lines Symbol: 22 Perpendicular bisector a line, segment, or ray that is perpendicular to the segment at its 23 Angle bisector a ray that divides an angle into two coplanar angles 24 Vertical angles two angles whose sides are rays 25 Adjacent angles two angles with a common side, a common vertex, but no common interior points 26 27 Complementary angles Supplementary angles two angles whose measures have a of 90 two angles whose measures have a of 180 28 Conjecture conclusion reached using inductive reasoning 29 Counterexample an example for which the conjecture is incorrect 30 Postulate accepted statement of fact