Geometry: The Illustrated Dictionary
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Angle
Circle
Perpendicular
Parallel
Segment
Collinear
Congruent
Translation
Rotation
Reflection
Collinear
Collinear points are points the always remain in a straight line no matter how they are moved.
The points
A
,
B
and
C
are all in a straight line creating three collinear points.
Notation: none