Interactive
Curated OER

My Test Book: Geometry Skills 2

For Students 5th - 7th
In this online interactive math skills worksheet, students solve 10 multiple choice math problems regarding geometry skills. Students may submit their answers to be scored.
eBook
Mathigon

Mathigon: Geometry: Polygons and Polyhedra: Polygons

For Students 9th - 10th Standards
This lesson focuses on polygons; a polygon is a closed, flat shape that has only straight sides. Polygons can have any number of sides and angles, but the sides cannot be curved.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Polygons and Areas of Plane Figures

For Students 9th - 10th Standards
Twenty-five problems cover the topics of polygons and finding the area for various plane figures. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View...
Unit Plan
Cuemath

Cuemath: Regular Polygon

For Students 9th - 10th Standards
Introduces the concept of regular polygons along with regular polygon examples, not regular polygons, irregular polygons, and area of a regular polygon. Check-out the solved examples for better understanding and try your hand at solving...
Handout
Geometry Help

Geometry Help: Pentagons and Hexagons

For Students 9th - 10th Standards
Explains the basic concept of pentagons and hexagons with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Identifying Polygons and Ellipses

For Students 4th - 5th
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are asked to look at images and identify ellipses and different types of polygons. Includes video demonstrating a sample problem...
Unit Plan
Other

Ic Teachers: Shapes: Polygons

For Students 9th - 10th
The properties of the four different types of polygons--pentagons, hexagons, heptagons, and octagons--are discussed here. Some practice questions are also given to test your knowledge.
Handout
The Math League

The Math League: Figures and Polygons

For Students 9th - 10th Standards
This site provides definitions of different types of polygons and figures.
Unknown Type
Khan Academy

Khan Academy: Area and Perimeter on the Coordinate Plane

For Students 9th - 10th Standards
Find the area or perimeter of shapes like triangles, rectangles, parallelograms, and hexagons on the coordinate plane. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Wolfram Research

Wolfram Math World: Math World: Hexagon

For Students 9th - 10th Standards
Gives a detailed overview of hexagons, particularly of regular hexagons. Be sure to use the links for unfamiliar notation or variable representation. This site gives formulas for inner radius, circumradius, parameter, and area of a...
Handout
Math Open Reference

Math Open Reference: Hexagon (6 Gon)

For Students 9th - 10th
Learn about hexagons with this resource which offers detailed explanations, examples, and an interactive. Subjects covered include properties of hexagons. 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.
Website
Primary Resources

Primary Resources: 2 D and 3 D Shapes

For Teachers Pre-K - 1st Standards
Here is a huge collection of teacher resources for teaching 2-D and 3-D shapes. Includes smartboard and PowerPoint presentations, as well as worksheets and helpful hints.
Activity
NumberNut

Number Nut: Shapes, Symbols, and Colors: 2 D Shapes

For Students K - 1st Standards
Did you know that two-dimensional shapes are also called polygons? This lesson describes the various 2-D shapes and includes two interactive games to reinforce skills.
Lesson Plan
PBS

Pbs Mathline Lesson Plan: Struts'n Stuff [Pdf]

For Teachers 3rd - 5th Standards
Incorporating concepts in algebra, number sense, patterning, data collection, and geometry, this lesson engages learners in various hands-on activities to explore the relationship between regular polygons and the number of diagonals...
Unit Plan
Khan Academy

Khan Academy: Properties of Shapes

For Students 4th - 6th
Identify and compare shapes based on their attributes. Shapes include triangle types, quadrilateral types, pentagons, and hexagons. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video...
Handout
Depaul University

Depaul University: Inscribing Regular Polygons

For Students 9th - 10th Standards
In this lesson, students learn to inscribe regular polygons inside a circle.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Inscribing a Hexagon in a Circle

For Teachers 9th - 10th Standards
In this task, young scholars inscribe a regular hexagon inside a circle and compare its area to that of the circle. Aligns with G-CO.D.13.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Partitioning a Hexagon

For Teachers 8th Standards
For this task, 8th graders are asked to partition a regular hexagon into congruent shapes and explain how they know they are congruent. Aligns with 8.G.A.
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.
Activity
Analyze Math

Analyze Math: Polygons Problems

For Students 9th - 10th Standards
Here are four problems about the area of a regular polygon. Start by finding the area of a hexagon inscribed in a circle of radius 10, and end by proving that as the number of sides of the polygon increases, the area of the polygon...
Interactive
Calculator Soup

Calculator Soup: Regular Polygon Calculator

For Students 9th - 10th Standards
Use this calculator to calculate properties of a regular polygon. Enter any 1 variable plus the number of sides or the polygon name. Calculates side length, inradius, circumradius, area, and perimeter.
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OER Commons

Oer Commons: Pre Assessment

For Teachers 6th - 8th Standards
Students solve for missing angle measures by applying what they have learned about types of angles and the angle measures of polygons. Students do a pre-assessment at the end of the lesson.
Whiteboard
ClassFlow

Class Flow: Segments and Polygons

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart reviews segments, parallel and perpendicular lines and then introduces polygons including quadrilaterals. It has many real world examples of shapes and includes Activote assessment.