Do Now
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DO NOW
• Take a ruler from the bookshelf. • Have your syllabus contract out and ready to turn
in. • Take out your notebook for this class.• In your notebook, describe the two types of
symmetry and draw an example of each.
TODAY’S OBJECTIVES
• Learn the terminology and notation of points, segments, lines, rays, planes, angles, and collinear and coplanar points.• Learn the idea of congruence of line segments• Learn how to mark congruence of segments on
diagrams• Begin keeping a notebook of definitions• Develop Problem Solving Skills
LINE
• Straight continuous arrangement of infinitely many points.• Has infinite length but no thickness• Extends forever in two directions• Named by the letter names of any two points on
the line and the line symbol.
PLANE
• Has length and width, but no thickness.• Flat surface that extends infinitely along its
length and width.• Represented with a 4-sided figure, like paper.• Named with a script capital letter.• P
ANCIENT “DEFINITIONS”
• “A point is that which has no part. A line is breadthless length.” –Greeks• “The line is divided into parts, and that part which
has no remaining part is a point.” –Chinese
IMPOSSIBLE TO DEFINE
• We would have to use the terms point, line, and plane to define them. • So we accept them as undefined and use them to
define everything else in Geometry.
LINE SEGMENT
• Consists of two endpoints of the segment and all the points between them that are collinear with the two points.
TODAY’S OBJECTIVES
• Learn the terminology and notation of points, segments, lines, rays, planes, angles, and collinear and coplanar points.• Learn the idea of congruence of line segments• Learn how to mark congruence of segments on
diagrams• Begin keeping a notebook of definitions• Develop Problem Solving Skills