Curated OER
Wikipedia: National Historic Landmarks in Washington, d.c.: Octagon House
Plantation owner's home lent to President Madison after the Burning of Washington in 1814.
Curated OER
Octagon1
A complex look at the octagon, which is an eight-sided polygon, from Mathworld.com.
Curated OER
American Stop Sign
A complex look at the octagon, which is an eight-sided polygon, from Mathworld.com.
Curated OER
Octagon2
A complex look at the octagon, which is an eight-sided polygon, from Mathworld.com.
Curated OER
Heilbrunn Timeline of Art History: Music in the Renaissance: Virginal
17th Century Rectangular Octagonal Virginal, made in Augsburg.
Beacon Learning Center
Beacon Learning Center: The Facts Please, Mr. Mumble
This interactive web lesson teaches students about two-dimensional shape attributes.
That Quiz
That Quiz: Practice Test: Shapes
This resource provides a practice geometry quiz for students to use.
Other
Pittsburg Post Gazette: Ohio Embankments Evidence of Sophisticated Culture
News article offering details of Great Circle of Newark Earthworks.
Cuemath
Cuemath: Regular Polygon
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...
OER Commons
Oer Commons: Polygons
Seventh graders find the area of regular polygons, recalling what they already know about the area of geometric shapes and generalizing a formula for any regular polygon.
Khan Academy
Khan Academy: Name Shapes 4
Practice identifying quadrilaterals, pentagons, hexagons, and octagons. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video tutorial, or receive hints.
Illustrative Mathematics
Illustrative Mathematics: 8.g Tile Patterns Ii: Hexagons
Eighth graders are presented with a pattern of octagon tiles. They are asked to answer questions about angle measures and hexagonal arrangements. Aligns with 8.G.A.5.
Better Lesson
Better Lesson: Happening Hexagons!
Hexagons are tricky! So close to stop-sign octagons, yet far less common. Plenty of practice is provided here.
Mathigon
Mathigon: Geometry: Polygons and Polyhedra: Polygons
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.
The Math League
The Math League: Figures and Polygons
This site provides definitions of different types of polygons and figures.
Other
Nature Canada: Connect With Nature: Worm Watch
WormWatch is a Canadian program that uses volunteers to observe changes in the earthworms in their environments, and submit their observations. Monitoring earthworms provides valuable information about the health of local soils so that...
Other
Transition Mathematics: Polygons
This site has an extensive definition of a polygon. The definition is followed by multiple-choice questions that ask the student to name specific polygons. There is a link for more questions about polygons.
Better Lesson
Better Lesson: Identifying 2 D Shapes
In this activity, 2nd graders will identify shapes found around the room by recognizing their attributes such as number of angles, vertexes, and faces.
The Math League
The Math League: Figures and Polygons
This website has basic definitions for most polygons, regular and irregular.
Quia
Ixl Learning: Identify Shapes I
This interactive media source asks students to determine which picture shape matches the name of the shape that is displayed in each question.
Rice University
Rice University: Cynthia Lanius: Hidden Polygon Activity
On this site students are instructed to locate different types of polygons on triangle grid paper. This page can be printed so that students can actually draw them. It also gives a definitions link for each polygon.
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