Basic Geometry Ideas

Points

Line segment and Line

Intersecting Lines

Parallel line

Ray

Curve

Polygon

An exact location

It has no size, only position

A line segment is a part of line that is bounded by two distinct end point

A line can be defined as a straight one-dimensional figure that has no thickness and extends endlessly in both directions

If two lines have one common point

Parallel lines are lines in a plane that are always the same distance apart. Parallel lines never intersect. 

A portion of a line which starts at a point and goes off in a particular direction to infinity

Simple curve

Open curve

Closed curve

Simple closed curve

A simple closed

figure made up of only line segments

The lines segments forming a polygon are called its sides.

The meeting point of a pair of sides is called its vertex.

Any two sides with a common endpoint - Adjacent Sides