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Name ______________________________ Plane Geometry 1.2 – 1.5 Guided Notes Word Definition Example A location with no size that is represented by a small dot and named with a capital letter. The set of all points. 1 Point 2 Space A series of points that extends in two opposite directions without end. Points that lie on the same line. 3 Line 4 Collinear A flat surface with no thickness. 5 Plane Points and lines in the same plane. 6 Coplanar Part of a line that consists of a starting point and an ending point. 7 Line Segment Part of a line consisting of one endpoint and all the points to one side. Two collinear rays with the same endpoint. 8 Ray 9 Coplanar lines that do not intersect. 10 Parallel Lines Lines on different planes that are not parallel and never touch. 11 Skew Lines Planes that do not intersect. 12 Parallel Planes 13. Two planes intersect at a line. For example, ___________________________________. 14. Two lines intersect at a point. For example, ____________________________________. Use the following pictures and information to fill in the examples above. F J E A B C I D L L H G K |a – b| 15 Distance of AB 16 AB + BC = AC Segment Addition Postulate 17 A point that divides a segment into two congruent segments. Midpoint 18 Formed by two rays with the same endpoint, sharing a common “vertex.” Name by vertex or 3 points with vertex in middle. AVB + BVC = AVC Angle 19 Angle Addition Postulate 20 Segments or angles with the same measure, denoted with tick marks. Congruent 21 Perpendicular Lines 22 Two lines that intersect to form right angles (90 degrees). A line, segment, or ray that is perpendicular to the segment and divides it into two congruent parts. A ray that divides an angle into two smaller congruent angles. Right Angle 23 Angle Bisector Use the following pictures and information to fill in the example column above. 15. Find AB 16. If AC = 40, find x. B C A B C A Find BC 3x + 29 2x – 4 -3 -1 2 Find AC 17. If B is the midpoint of AC, find x. A B C 2x – 1 20. A 18, 19, 21 A x+9 22. B A V C B C V D 23. If ray VB is a bisector of angle AVC, find x, AVB, and BVC. A B x+4 V B C C