Annenberg Foundation
Annenberg Learner: Geometry 3 D Shapes: Platonic Solids
Learn about platonic solids, a special type of polyhedra. Read a definition, make three-dimensional models using printouts, and play with an interactive animation, which will show you the faces, vertices, and edges on platonic solids:...
CK-12 Foundation
Ck 12: Geometry: Polyhedrons
[Free Registration/Login may be required to access all resource tools.] This concept teaches students about polyhedrons, Euler's Theorem, and regular polyhedrons.
CK-12 Foundation
Ck 12: Geometry: Polyhedrons
[Free Registration/Login may be required to access all resource tools.] Apply Euler's Theorem.
Oswego City School District
Regents Exam Prep Center: Polyhedra
View and learn about five different polyhedra: tetrahedron, octahedron, icosahedron, hexahedron, and dodecahedron. Learn what Euler's Polyhedra Theorem is, and see examples of non-polyhedra as well.
University of Georgia
University of Georgia: Inter Math: Platonic Solids
This site gives a description of platonic solids along with a visual representation of each of the five platonic solids. At the bottom of the page are links to cut-out-templates for each of the platonic solids. Be sure to follow the...
Khan Academy
Khan Academy: Nets of Polyhedra
Practice matching 2D nets to the 3D shapes the fold up into. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Mathigon
Mathigon: Geometry: Polygons and Polyhedra: Polyhedra
This lesson focuses on polyhedra; a polyhedron (the plural is polyhedra) is a 3-dimensional solid object that is made up of polygons. Euler's Polyhedron Formula: In every polyhedron, the number of faces (F) plus the number of vertices...
CK-12 Foundation
Ck 12: Geometry: Polyhedra Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide reviews how to classify polyhedra, Euler's formula, and regular polyhedra.
University of Georgia
University of Georgia: Inter Math: Edge
This site gives a description of edge along with a visual representation. Be sure to use the links to related terms, everyday examples, challenging problems, more information, and the interactive check point located in the left-hand column.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Polyhedra Classification
This question and answer site provides a lot of basic information about polyhedra. The five regular polyhedra, "The Platonic Solids," are described.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Naming Polygons and Polyhedra
This site gives you the prefixes for naming polygons and polyhedra.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Polyhedrons
This in-depth paper examines the idea of convexity. Euclid's Elements, the first geometry textbook, assumed convexity without mentioning the term.
Other
Polyhedra: The Five Platonic Solids
A brief site that includes some activities to understand the figures.
Other
Personal Site: Pyramids, Dipyramids, and Trapexohedra
This site is a personal site that discusses the popular polyhedron, the pyramid. It explains that by joining two pyramids you will get a dipyramid.
Other
Jim Plank's Origami Page: Making a Truncated Tetrahedron
This website provides instructions on how to create a truncated tetrahedron.
National Council of Teachers of Mathematics
The Math Forum: Polyhedra Nets Paper
Contains six examples of polyhedra nets (cube, tetrahedron, octahedron, dodecahedron, icosahedron, cubosctahedron).
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Telar Del Pensamiento Matematico
In Spanish. Different mathematical topics are presented with questions and activities.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Polyhedra
Find a quick, concise explanation of what a polyhedra is. Examples are given and clearly explained.
Math Is Fun
Math Is Fun: Polyhedron
Students learn about the terminology and formulas associated with polyhedrons. The learning resource consists of definitions, images, and examples.
Math Is Fun
Math Is Fun: Spinning Icosahedron
Students learn about the terminology and formulas associated with an icosahedron. The learning resource consists of definitions and an interactive spinning icosahedron.
University of Cambridge
University of Cambridge: Nrich: Skeleton Shapes
At this one page website a variety of polyhedra are shown. The challenge is to create the skeleton for each polyhedron and identify the needed materials. You can check your solution right at the website.
University of Cambridge
University of Cambridge: Nrich: A Chain of Eight Polyhedra
Eight different polyhedra are given along with a challenge in this game. Can you arrange them so that their faces match in a chain? A solution is available to check your answers.
University of Cambridge
University of Cambridge: Nrich: Building With Solid Shapes
Predict which solid shape constructions would be unstable as shown at this one page website. Solutions are available right at the website.
National Council of Teachers of Mathematics
Nctm: Figure This: Cut the Cake
A math challenge where geometry, measurement, and problem solving meet. Explore the properties of three dimensional shapes when you discover how six friends can equally divide a nine inch square chocolate cake. A one page activity from...