Point
A specific place in space. They are infinitely small (they have no size)
and are denoted by a single capital letter,
in this case, A.
Line
A straight path that extends infinitely in both directions.
Lines are denoted by two points on the line under a line symbol, <->.
Also, they are made up of an infinite number of points.
Plane
A flat surface that extends infinitely in all directions.
Planes have no thickness whatsoever and can be made using a minimum of three points.
Shown here is a plane being intersected by two lines.
Planes are named by four points on the plane
(i.e. "plane ABCD").
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