# What is a Polygon?

Monday, November 7, 2016

In this animated video I would like to talk about Polygons

Polygons are 2-dimensional closed shapes.

A closed shape does not have any openings, and all of the lines connect.

You can’t leave the inside of a closed shape without crossing a line.

Polygons have straight lines and do not have curves

A polygon has three parts.

Straight Lines

Vertices which are the point at which the lines intercept

Angles are formed by intercepting lines

There are several types of polygons

A regular polygon has equal lines and angles

An irregular does not have equals lines and angles

A concave polygon has one angle greater than 180 degrees

A convex polygon does not have any internal angles greater than 180 degrees

A simple polygon does not have any lines that cross over.

A complex polygon has at least one line that crosses over itself

Polygon names

Named after the number of sides and angles

Triangle 3 sides

Quadrilateral

Pentagon 5

Hexagon 6

Heptagon 7

Octagon 8

Nonagon 9

Decagon 10

Hendecagon 11

Dodecagon 12

After 12 sides it is acceptable to give the number of sides and then gon

For example 14 gon has 14 sides

You may also enjoy...

Polygon Song

https://www.youtube.com/watch?v=69lfT...

What is a polygon, and different shapes.

https://www.youtube.com/watch?v=dRtbC...

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