In this lesson we will take a look at the 3-Dimensional world we live in. Look at the image below. You will see two points.
A line has only one dimension --length. The line has no endpoints and extends forever in both directions. That is why when a line is drawn, we see arrows at both ends. On the other hand when we draw a line segment on a piece of paper it has endpoints.
Question 1: How many endpoints does a line segment have?
The line, ray and line segment are all examples of 1-Dimensional objects since they only have length.
Review measuring length of a line segment using Jsmol
2: What is the length of line segment CD in Angstroms to the nearest hudredth? Go to Geometry of 2-Dimensions