Young scholars explore what the Bermuda triangle is and the theories as to why it is so mysterious.  In this mystery lesson students read and discuss the history and the mystery behind the Bermuda Triangle. 

From polyhedrons to platonic solids, here is a lesson that will have your classes talking! As an introduction to platonic solids, scholars cut and fold nets to create the three-dimensional solids. They use an interactive component to...

In this video segment [2:01] from Cyberchase, the CyberSquad finds that by arranging triangle tiles they are able to create a path that will allow them to cross a river of hot lava.

Film and special features on the Triangle Shirtwaist Fire of 1911. Features include a timeline of the deadliest workplace accidents, biographies of famous women of the time, and primary resources of the coverage of the fire. For...

Site is devoted to every facet of the tragedy at the Triangle Shirtwaist Company. Primary source documents, oral histories, photographs, newspaper articles, and a list of victims is included in this comprehensive site.

Learn about equilateral, right angle, and isosceles triangles on this site. Learn how they work, terms, tricks and examples. .

This site gives a very thorough explanation of how to tell if two triangles are congruent. Dr. Math explains why SSS, SAS, ASA determine that two triangles are congruent. The Dr. gives a few exercises for the reader to try then gives the...

In this video segment adapted from ZOOM, the cast tries to design and build a bridge made out of drinking straws that will support the weight of 200 pennies. [4:02]

Site opens with a terrible picture of victims of the fire that draws the reader into the incredible story of this tragedy. A very comprehensive site with newspaper articles, trial testimony, maps of the building, and photographs.

Dr. Math gives a hint of how to prove the triangle inequality theorem when answering a question posed about proving an absolute value problem using the triangle inequality theorem.

Here at the Math Forum, Dr. Math proves the concurrency of the altitudes of a triangle. Links are provided for associated topics.

At this page you will find Dr. Math responding to an inquiry about the relevance of the names of each of the special triangle centers.

At this site you will find the proof of the existence of the centroid for any triangle.

Dr. Math, responds to a question fro a nineth grade stduent who wants to understand hyperbolic geometry. The Dr. uses descriptive analogies in attempts to unravel why triangles in hyperbolic geometry have less than 180 degrees in them.

Explains the terminology for angles of elevation, depression, inclination, and declination. Demonstrates how to 'translate' exercises into triangles and equations.

At this site you will find am online discussion about the centroid of a triangle. The page begins with a discussion of observations leading to the centroid of a triangle. Dr. Math explains the correct findings as well as the errors made...

Dr. Math shows how to construct the orthocenter of any triangle using a compass and straight edge.

Explore the literature connections, online activity, pencil and paper activity, and the manipulative investigation of patterns and geometric shapes on this page!

In this video segment from Cyberchase, two friends make rock candy while learning about 2-D and 3-D shapes.

This interactive site offers students resource for learning about composers, their works, the logistics of orchestra seating, the functions of different instruments, and the like.

[Free Registration/Login Required] A great look at the Progressive Era, the issues dealt with at that time, and the legistlation passed to help alleviate social ills. Read about the great range of personalities and viewpoints that drove...

Learn about the chemical reactions that take place when things burn in this interactive activity from the NOVA Web site.

Learn about the theory of mercantilism and how it affected the economies of the New England, Middle, and Southern colonies. Practice making a bar graph showing the value of exports to and imports from England between 1700 and 1774 with...

Read Olaudah Equiano's account of being captured in his village in Africa, and placed on a slave ship to be taken to America. He describes the middle passage of the triangular trade route, as well as the leg from Europe to Africa. [pdf]