Math 142 ____ NAME: _______________________

Web Assignment 15

Seat: ______

Exploration of web sites to understand polygons, their angles and tessellations to go with section 12.4.

Go to my “people” web site http://people.uncw.edu/spikek then click on “links”.

Scroll down to chapter 12 and explore the web sites in the table from the topic “polygons” through the topic “Tessellations – Escher Art”.

6pts

Turn in the Regular Polygons Worksheet to go with this quiz. Label each polygon with its name, its number of sides, and give the degree measure for the vertex angle of each polygon on the Regular Polygon Worksheet.

1. What is the name for a 7 sided polygon?____________

What is the name for a 12 sided polygon?____________

2. What is the sum of all vertex angles of a convex hexagon? ________

What is the measure of one vertex angle of a regular hexagon? _______

What is the measure of an exterior angle of a regular hexagon? ______

What is the measure of a central angle of a regular hexagon? ________

4pts

3. a. Define a tessellation.

b. Define a regular tessellation.

c. Define a semi-regular tessellation.

2pts

4. Is it possible to form a semi-regular tessellation with a combination of hexagons and triangles? _____ Explain why or why not, using the measure of the vertex angles.

1pt 5. Which polygon did you see most often in the snowflake pictures? http://www.snowflakebentley.com/snowflakes.htm (Note: click on each picture in the chart to get a full-screen view of each snowflake.)

2pts 6. Describe one of the websites you explored and why you liked it?