Annenberg Foundation
Annenberg Learner: Geometry 3 D Shapes
Learn about several three-dimensional geometric shapes and the terminology used to describe them. Learn how to calculate their surface area and volume, and explore their mathematical properties.
National Council of Teachers of Mathematics
Nctm: Illuminations: Geometric Solids
The instructional tool explores various geometric solids and their properties. Student can manipulate and color the different shapes. Learners examine the edges, faces, and vertices of the different solid figures.
Math Is Fun
Math Is Fun: Area of Triangles Without Right Angles
Learn how to find the area of triangles without right angles. Find the formula to use depending on the information you know about the triangle: base and height, three sides, or two sides and an angle.
Analyze Math
Analyze Math: Geometry Problems on Squares
The geometry tutorial investigates word problems on squares with detailed solutions. Topics included are perimeter and area of a square.
The Math League
The Math League: Surface Area
This tutorial explains the concept of surface area, and then goes through multiple shapes offering the specific surface area formula for each one.
Wolfram Research
Wolfram Math World: Surface Area
A good site explaining surface area. Scroll down the page for quick references to surface area formulas for fundamental geometric objects. The site has links to related topics.
SEN Teacher
Sen Teacher: Nets
Generate different "nets" for paper construction of common three-dimensional shapes: cube, cuboid, pyramid, cone, tetrahedron, cylinder, octahedron, rhombic prism, dodecahedron, pentagonal prism, and pentagonal prism.
Science Struck
Science Struck: List of Different Types of Geometric Shapes
A comprehensive list of 2D shapes and 3D solids with everything from a triangle to a dodecahedron. Includes illustrations and short descriptions of attributes for each.
Science Struck
Science Struck: A Comprehensive Printable List of Geometry Formulas
Provides a list of area and perimeter formulas for two-dimensional shapes and volume and surface area formulas for three-dimensional solids.
Khan Academy
Khan Academy: Volume and Surface Area Word Problems
Practice finding volume and surface area in these word problems.
National Council of Teachers of Mathematics
Nctm: Illuminations: Geometric Solids
An interactive game to find number of edges, surfaces and vertices of different geometric shapes.
Better Lesson
Better Lesson: Covering and Filling: Surface Area & Volume of Rectangular Prisms
Students apply their knowledge of surface area and volume to solve some problems for a box company. This lesson plan contains a detailed lesson plan, video explanations, rubrics, group work guidelines, slides containing problems, and...
National Council of Teachers of Mathematics
Nctm: Illuminations: Area of Trapezoids
Investigate how changes in the base and height of a trapezoid affect its area.
Geometry Help
Geometry Help: Quadrangles
Explains the basic concept of quadrangles (quadrilaterals} with step-by-step instructions and methods for solving specific problems on your own relating to this topic.
Quia
Ixl Learning: What Is Surface Area?
Brush up on your math skills relating to surface area then try some practice problems to test your understanding.
Quia
Ixl Learning: Area of Trapezoids
Brush up on your math skills relating to the area of trapezoids then try some practice problems to test your understanding.
Quia
Ixl Learning: Area of Parallelograms
Brush up on your math skills relating to the area of parallelograms then try some practice problems to test your understanding.
Quia
Ixl Learning: Area of Rhombuses
Brush up on your math skills relating to the area of rhombuses then try some practice problems to test your understanding.
Quia
Ixl Learning: Area of Triangles
Brush up on your math skills relating to the area of triangles then try some practice problems to test your understanding.
NumberNut
Number Nut: Shapes, Symbols, and Colors: 3 D Shapes
This lesson describes three dimensional shapes and provides two interactive practice activities.
Mr. Martini's Classroom
Mr. Martini's Classroom: Volume: Geometry Practice Solving Volumes
Students solve for the volume of three-dimensional figures such as cubes, prisms, and cylinders with these interactive flashcards.
Other
Polyhedra: The Five Platonic Solids
A brief site that includes some activities to understand the figures.
Learning Wave Communications
Learning Wave: Geometry, Section 2
Geometry concepts are briefly discussed at this site, including volume of a cylinder, parallelograms, circles, trapezoids, and triangles. Sample problems and applications are included for practice.