Triangles are all about threes, and practicing proving postulates is a great way to get started. The first page of the worksheet provides a brief introduction of the different properties and postulates. The remaining pages contain...

An excellent resource for a geometry class, as well as for an electrical engineering course. A thorough reference sheet covers geometric shapes such as triangles, parallelograms, and circles, as well as 3-D shapes and the Pythagorean...

Your young learners will enjoy having quick access to this reference sheet that includes a multiplication chart, formulas for perimeter, area, and volume, place value chart, fraction chart, basic types of polygons, triangles and lines...

Develop young mathematicians' knowledge of two- and three-dimensional shapes with this geometry workbook. From learning about the classifications of different shapes and figures to calculating their area, perimeter, and volume, this...

Address key vocabulary in the seventh grade Common Core Math Standards with this comprehensive list. A series of word cards is also provided that supports each term with images and examples, making this an excellent tool for teaching the...

Provides definitions, formulas, and examples relating to the special right triangle, the 30-60-90 degrees.

A complete reference guide to congruent triangles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

Comprehensive lesson features proofs and examples that establish that the theorem that states "the sum of the measures of the interior angles of a triangle equals 180 degrees" is actually true.

Wikipedia explores the history of the Bermuda Triangle and supposed associations with paranormal activities. Content includes a look at the first mention of the Bermuda Triangle, its growth in popularity, skeptical responses, and famous...

Thought provoking entry discusses the many outrageous ideas about the so-called mysterious disappearances of the Bermuda Triangle area in the Atlantic Ocean.

Demonstrates how to translate, set up, and solve basic right-triangle word problems.

This site contains a comprehensive study of triangle centers. Seems more for an advanced level. Provides a list of six links to 1114 centers.

Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.

A description of the legs of a triangle is provided along with a visual representation. Be sure to follow the links to related terms, everyday examples, challenging problems, more information, and the interactive check-point involving...

Explains mean proportionals (or geometric means) by providing theorems and examples.

An interesting approach to how to analyze a speech. Presents a rhetorical pentangle as well as a rhetorical triangle, where each of the vertices represents an item to analyze. There is also an outline of the different areas to examine in...

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.

Provides definitions and detailed examples relating to the Law of Sines with the ambiguous case.

Explains the basic terminology and formatting of ratios, and demonstrates how to solve typical exercises.

Explore full angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.

Explore reflex angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.

A comprehensive guide for learning all about the basics of trigonometry, the various identities-formulas of trigonometry, solved examples, and practice questions.