Plane Figures and polygons

Today was the start of our Geography unit, we will be learning about shapes, figures, sizes and units of measure, conversions, and significant digits.

Today I learned about Plane Figures.

A plane is a figure that is flat like the top of a table but the figure extends infinitely, planes has no thickness and has infinite ways of direction.

You can draw arrows out to infinite points in many directions.

Plane website can help you see more clearly what a plane is.

Here are some examples of some planes.

 











Polygons are also the topic from today's class.
A polygon is a simple closed curve that is the union of line segments.  Polygons are usually put into catergories based on thier number of line segments. 
To be a polygon the figure must be closed, and it must be made of line segments.
Below is not an example of a polygon:

There are only two line segments, so this does not make it a polygon.

There are also figures that are called regular polygons, these figures have all sides the same legnth, and all angles are the same.

these are examples: