1-6 Classifying Polygons

1-6 Classifying Polygons
Goal: To classify polygons

What is a polygon?

A polygon is a closed plane figure with the following properties:

• Formed by 3 or more line segments called sides.

• Each side has EXACTLY two endpoints.
  
  

Multiple Select

Choose all images that can be classified as polygons.

Multiple Select

Choose all images that cannot be classified as polygons.

​A polygon is convex if no line that contains a side of the polygon contains a point in the interior.

(No sides intersect at any point other than the endpoints. Points all push outwards.

​​Convex Polygons

A polygon is concave if it is not convex.

(The figure has a section that dips inward.)

​​Concave Polygons

Multiple Choice

Is the figure convex or concave?

• Convex

• Concave

Multiple Choice

Is the figure convex or concave?

• Convex

• Concave

Multiple Choice

Is the figure convex or concave?

• Convex

• Concave

Multiple Choice

Is the figure convex or concave?

• Convex

• Concave

Polygons can be classified based on how many sides they have.
They first 10 have special names.

​

Classifying Polygons

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Multiple Choice

A polygon with four sides is called a ______.

• polygon

• square

• quadrilateral

• vertex

Multiple Choice

A polygon with five sides is called a _____.

• hexagon

• pentagon

• quadrilateral

• heptagon

Multiple Choice

A polygon with eight sides is called a _____.

• hexagon

• pentagon

• heptagon

• octagon

Multiple Choice

A polygon with nine sides is called a ______________?

• triangle

• nonagon

• hendecagon

• nopeagon

Categorize

Options (7)

Go Dawgs!

Organize these options into the right categories

Convex Polygon

Concave Polygon

Not a Polygon

Bulldog

Match

Match the following

Convex Triangle

Concave Quadrilateral

Concave Dodecagon

Convex Nonagon

Not a Polygon

• Convex Triangle

• Concave Quadrilateral

• Concave Dodecagon

• Convex Nonagon

• Not a Polygon