Lesson Plan
Willow Tree

Interior Angles, Exterior Angles, and Diagonals of Polygons

For Students 8th - 11th Standards
How does the number of sides of a polygon affect the angle measures? Learners recognize a pattern in finding the total measure of interior and exterior angles and the number of diagonals. They use the patterns to calculate...
Handout
Math Open Reference

Math Open Reference: Irregular Polygon

For Students 9th - 10th
A complete reference guide to irregular polygons. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Polygons

For Students 9th - 10th
Get the definition and properties of a polygon. Then explore such topics as: 1) types of polygon 2) area 3) Perimeter 4) angles associated with polygons and 5) names of polygons.
Handout
Math Open Reference

Math Open Reference: Interior Angles of a Polygon

For Students 9th - 10th
Learn about interior angles of a polygon with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Concave Polygon

For Students 9th - 10th
Learn about concave polygons with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Convex Polygon

For Students 9th - 10th
Learn about convex polygons with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
The Math League

The Math League: Figures and Polygons

For Students 3rd - 8th Standards
This website has basic definitions for most polygons, regular and irregular.
Handout
Math Open Reference

Math Open Reference: Center of a Polygon

For Students 9th - 10th
A complete reference guide to the center of a polygon. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
The Math League

The Math League: Figures and Polygons: Nonagons

For Students 9th - 10th Standards
This site provides definitions and examples of the various types of polygons including nonagons.
Handout
University of Georgia

University of Georgia: Inter Math: Nonagon

For Students 6th - 8th
This site gives the general definition of a nonagon with examples of a regular (convex) and irregular concave nonagons. There are links to related terms, challenging problems, more information, and the interactive check point involving...
Handout
Math Open Reference

Math Open Reference: Circumcircle

For Students 9th - 10th Standards
A handy reference guide to circumcircles. It provides definitions and examples that enhance further explanation. Includes links to related topics.

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