Unit Plan
CK-12 Foundation

Ck 12: Regular and Irregular Polygons

For Students 9th - 10th
[Free Registration/Login Required] Students explore the concept of regular and irregular polygons by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Regular and Irregular Polygons

For Students 6th - 7th
[Free Registration/Login may be required to access all resource tools.] Understand the difference between regular and irregular polygons.
Lesson Plan
Better Lesson

Better Lesson: Area of Irregular Polygon

For Teachers 3rd Standards
Third graders look for break apart irregular polygons to make arrays to find the area of these common shapes.
Lesson Plan
Better Lesson

Better Lesson: Finding Arrays in an Irregular Polygon

For Teachers 3rd
Third graders decompose an irregular polygon into arrays to find the area.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Regular and Irregular Polygons

For Students 7th
[Free Registration/Login may be required to access all resource tools.] Identify regular polygons and their characteristics
Activity
Texas Instruments

Texas Instruments: Numb3 Rs: Irregular Polygon Centroids

For Teachers 9th - 10th
Based off of the hit television show NUMB3RS, this lesson has students explore finding the centroid of an irregular polygon by finding the mean of the coordinates of the polygon's vertices. Further, students find the centroid given that...
Lesson Plan
Better Lesson

Better Lesson: Area in Real Life With Irregular Polygons

For Teachers 3rd Standards
Dividing an irregular shape into rectangles helps students find the area of an irregular shape.
Interactive
Sophia Learning

Sophia: Sum of Angles in Polygons

For Students 6th - 8th
This tutorial with video and slideshow components investigate the characteristics of polygons as well as how to calculate the interior and exterior angles of any polygon. It offers two PowerPoint presentations and two videos that feature...
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.
Unit Plan
Math Is Fun

Math Is Fun: Area of Irregular Polygons

For Students 9th - 10th Standards
Learn how to use coordinates to calculate the area of an irregular polygon.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Polygon Classification

For Students 8th
[Free Registration/Login may be required to access all resource tools.] Identifying polygons, their diagonals and their angles
Unit Plan
Math Is Fun

Math Is Fun: Properties of Regular Polygons

For Students 3rd - 8th
Find a definition of regular polygon, and learn how to calculate the internal angle, external angle, and number of diagonals of a regular polygon. Also, learn how to find the area of regular polygons.
Unit Plan
Sophia Learning

Sophia: Classifying Polygons

For Students 6th - 8th
This lesson explores the characteristics of various types of polygons. It includes two PowerPoint presentations that test students' understanding by grouping polygons in the correct categories.
Whiteboard
SMART Technologies

Smart: Polygons

For Teachers 3rd - 5th
This SMART Notebook lesson allows students to characteristics of polygons by exploring vocabulary and sample problems.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Area of Regular Polygons

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students to calculate the area and perimeter of regular polygons. Students examine guided notes, review guided practice, watch instructional...
Whiteboard
ClassFlow

Class Flow: Area

For Teachers 3rd - 5th
[Free Registration/Login Required] This flipchart teaches students how to find the area of an irregular polygon.
Unit Plan
Vernet -Virtual Education Resources Network

Salon Hogar: Referencia Rapida De Formulas Geometricas

For Students 9th - 10th Standards
This site provides the user with a useful reference to different geometric forms, their elements, formulas, and areas. Entirely in Spanish.
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...
Unit Plan
Khan Academy

Khan Academy: Area of Composite Shapes

For Students 5th - 7th Standards
Practice finding the areas of complex shapes that are composed of smaller shapes. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

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