THE LITTLE BOOK OF BASIC GEOMETRY
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Table of ContentsLoading...
Basic Geometric TermsLoading...
LinesLoading...
AnglesLoading...
Angle PairsLoading...
One More AnglePOINT
A point is an exact location in space.
.
m
You say "point m."
You write m or point m.
You write m or point m.
LINE
A line is a straight path of points that goes on forever in two directions.
You say "line ab."
You write .
You write .
LINE SEGMENT
A line segment is a part of a line with points on each end.
You say "line segment ab."
You write .
You write .
RAY
A ray is a part of a line with one endpoint, extending endlessly only in one direction.
You say "ray yz."
You write .
You write .
MIDPOINT
A midpoint is a point that lies halfway between the two endpoints of a line segment.
You say "midpoint m."
You write m or point m.
You write m or point m.
PLANE
A plane is a flat surface extending endlessly in all directions.
You say "plane def."
You write .
You write .
CONGRUENT LINE SEGMENTS
Line segments with the same length
You say "line segment AB is congruent to line segment XY."
You write .
You write .
INTERSECTING LINES
Lines that meet at a point of intersection
You say "line AB intersects line XY at point C."
You write .
You write .
PARALLEL LINES
Lines that do not intersect
You say "line AB is parallel to line XY."
You write .
You write .
PERPENDICULAR LINES
Intersecting lines that form right angles
You say "line AB is perpendicular to line XY."
You write .
You write .