Download Ray -- a part of a line. Rays have one endpoint and they extend

8-1 Building Blocks of Geometry
# of dimensions:
0
Points -- Written using a CAPITAL letter.
Points take up no space!
1
Lines -- Written by using either a lower-case
letter, or by using two CAPITAL letters.
No thickness. Infinite length in both directions.
2
Planes -- Written by naming 3 points (in any order)
on the plane's surface. No thickness.
Infinite length and width.
8-1 Building Blocks of Geometry
Ray -- a part of a line. Rays have
one endpoint and they extend
forever in one direction.
Segment -- a part of a line or a ray.
Segments have two endpoints.
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8-1 Building Blocks of Geometry
Congruent -- same shape & size
Similar -- same shape
≅
~
You can show that line segments are
congruent by using tick marks.
These marks can also be used to
show congruent angles.
8-1 Building Blocks of Geometry
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