An introduction to geometry

A point in geometry is a location. It has no size i.e. no width, no length and no depth. A point is shown by a dot.

A line is defined as a line of points that extends infinitely in two directions. It has one dimension, length. Points that are on the same line are called collinear points.

A pedigree is defined by two points and is written as shown out cold gone an arrowhead.

Two lines that meet in a reduction are called intersecting lines.

A share of a heritage that has defined endpoints is called a origin segment.  A descent segment as the segment surrounded by A and B above is written as:

A plane extends infinitely in two dimensions. It has no thickness. An example of a zeppelin is a coordinate plane. A plane is named by three points in the blimp that are not upon the same parentage. Here under we feel the jet ABC.

A space extends infinitely in all directions and is a set of all points in three dimensions. You can think of a space as the inside of a box.