Lines, Points, and Planes

 

 

Let's begin with the basic building block of geometry...lines! Without lines an shape would not be able to exist!

A straight line extends forever, and always equals 180 degrees as seen above.

 A line segment is a portion of a line, that ends in two points creating the segment.

A ray starts from one single point and extends into one direction only.

An angle is created by 2 rays extending from a single point.

Intersecting lines cross each other and have exactly one point in common.

Parallel lines NEVER cross, and have no points in common.

Lastly we have perpendicular lines that form a right angle of 90 degrees!