Polygons

Objectives : Classify polygons based on their sides and angles. Find and use the measures of interior and exterior angles of polygons.

A __polygon__ is a closed plane figure formed by three or more segments that intersect only at their endpoints.

In this polygon game, you will classify different polygons based on their properties. Everytime you make a mistake, the game restarts from the beginning. So let us get started with the [|Polygon Game.]

You will learn to recognize all the common polygons while playing this matching game. Pay close attention to segments which are marked as congruent. Also, notice the identification of parallel lines on the polygons. Play the [|Polygon Matching Game]

Watch this video to see how to use diagonals to separate polygons into triangles. Then use your knowlege, that the sum of the degrees of a triangle is 180 degrees, to find the angle sum of a polygon. This video derives a formula for the [|Polygon Angle Sum Theorem]

To complete this assignment,  you must answer the following 15 questions by following links to the websites provided __before__ each set of questions.. As a result of this activity, you will be able to identify and classify Polygons.

Please record your answers on a separate sheet of paper to be collected. There is no need to re-write the questions, just number the answers. They will be returned to you.

Tip: Look at all of the questions to be answered on the sight before visiting the sight to make your life easier! All of the answers are there, however if you are having trouble answering a specific question, you may enter it on "ask.com" to find the answer or have more clarification.

[] 1. What exactly is a polygon?

[] 2. Draw 3 examples of polygons. Label the vertices. 3. Draw 3 examples of figures that are NOT polygons.

[] 4. What does it mean to be a regular polygon? 5. How do we classify polygons? 6. What is a 4 sided polygon? 7. What is a 12 sided polygon?

[] 8. Make a chart for the special names of polygons from a 3-gon through a 12-gon, plus an n-gon.

[] 9. What is a segment called that connects a vertex of a polygon with another nonadjacent vertex?

[] 10. Draw an example of a concave polygon, and describe "concave" in your own words. 11. Draw an example of a convex polygon, and describe "convex" in your own words.

[|Polygon interior angles] 12. How do you find the sum of the measures of the interior angles of a polygon? 13. Using the formula, what would the interior angles of a pentagon add up to?

[|external angles of a polygon] 14. What do the exterior angles of any polygon add up to? 15. What is the sum of only one exterior angle of a regular hexagon?

Next, see how fast you are at unscrambling polygon related vocabulary in [|Half-a-Minute] You may use the polygon table you have just created.

(Adapted from Mrs. K. Heckman's wikispace)