Geometry Help
Geometry Help: Area of Geometric Shapes
Explains the basic concept of the area of geometric shapes with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Math Open Reference
Math Open Reference: Heptagon (7 Gon)
Learn about heptagons with this resource which offers detailed explanations, examples, and an interactive. Subjects covered include properties of heptagons and heptagonal coins. Links to related topics.
CK-12 Foundation
Ck 12: Interactive Geometry: 9.5 Modeling in Three Dimensions
Explore connections between a 2-dimensional net and a 3-dimensional box. Later in this section, use equations with variables to solve real world problems that use 2 and 3-dimensional objects.
CK-12 Foundation
Ck 12: Interactive Geometry: 9.4 Connections Between Two and Three Dimensions
Cross-sections are one way that two-dimensional objects are connected to three-dimensional objects.
CK-12 Foundation
Ck 12: Interactive Geometry: 9.3 Spheres
Learn how the components and properties of a sphere are analogous to those of a circle.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.9 Composite Shapes
Learn how to manipulate and measure composite shapes.
National Council of Teachers of Mathematics
The Math Forum: Geometry Turned On
This Math Forum site contains many mathematical and geometric explanations and proofs of many different topics that have been done using a geometry software called Geometer's Sketchpad. The explanations are very detailed and clear;...
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.
University of Toronto (Canada)
Question Corner: Higher Dimension Geometry
Use this site to discover how we represent higher dimensional objects in mathematics and how one might draw a four dimensional object on two dimensional paper and modeling fourth degree tetrahedron.
Wolfram Research
Wolfram Math World: Dimension
This site from Mathworld.com provides information on what the dimension of an object means.
Other
Ohio Resource Center: Shadows
This applet helps students visualize the shapes of shadows cast by a cube with a light coming from different angles. This helps students visualize shapes from different angles and to identify, sketch and classify the cross-sections of...
ClassFlow
Class Flow: Mystic Rose
[Free Registration/Login Required] In this flipchart, students apply algebraic and geometric sense to create geometric figures including a Mystic Rose.
ClassFlow
Class Flow: Pentominoes
[Free Registration/Login Required] Students use geometric sense to create congruent shapes and figures in multiple orientations using transformations.
ClassFlow
Class Flow: Similar Shapes
[Free Registration/Login Required] In this flipchart, students use the drawing and interactive tools in Activstudio to apply geometric properties and relationships to describe, compare, and draw two-dimensional shapes and figures.
ClassFlow
Class Flow: Summing Differences
[Free Registration/Login Required] In this flipchart, students apply their understanding of geometric properties and relationships. Students use geometric properties and relationships to describe, compare, and draw two-dimensional shapes...
Free Math Help
Free Math Help: Geometry Vocabulary
The lesson investigates vocabulary used in Geometry. Definitions and examples are included.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Polyhedra
Find a quick, concise explanation of what a polyhedra is. Examples are given and clearly explained.
ClassFlow
Class Flow: Algebra, Geometry Conic Review
[Free Registration/Login Required] Flipchart helps student to interpret algebraic equations and inequalities, geometry (cones, spheres, parabolas, etc.) and describes geometric relationships algebraically.
ClassFlow
Class Flow: Graph of an Equation
[Free Registration/Login Required] In 1637, Rene Descartes revolutionized the study of mathematics by joining its two major fields, algebra and geometry. With Descartes's coordinate plane, geometric concepts could be formulated...
ClassFlow
Class Flow: Impossible Objects
[Free Registration/Login Required] In this lesson, students use math to create two dimensional illusions in the form of impossible objects. Students use the drawing and measuring tools to create mathematical art.
Math Is Fun
Math Is Fun: Symbols in Geometry
The resource investigates common symbols used in geometry. Examples and definitions are included.
Math Is Fun
Math Is Fun: Torus
Students learn about a torus. The resource consists of facts, formulas, definitions, and images.
Math Is Fun
Math Is Fun: Spinning Octahedron
Students learn about the terminology and formulas associated with an octahedron. The learning resource consists of definitions, a spinning octahedron, and examples.