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Triangle Medians
MathWorld provides an example and explanation for the median of a triangle. Lines A1M1, A2M2, and A3M3 are the medians of triangle A1A2A3.
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An Image of Freytag's Triangle Showing the Structure of a Narrative.
Teaching the plot structure of narratives is made easy with this diagram of Freytag's Triangle (also known as the plot pyramid).
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Top Triangle
This site explores the area of congruent triangles and how it is a difficult area to understand.
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Bottom Triangle
This site explores the area of congruent triangles and how it is a difficult area to understand.
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New Triangle = 18 Cm Squared Divided by 3=6 Over 8 or 3 Over 4
This site explores the area of congruent triangles and how it is a difficult area to understand.
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Eternal Egypt: Stela With a Form of Pediment
The funerary stela, an upright stone with a sculpted surface, has a curved top and is divided into two sections. The upper section contains three interconnected triangles that form a pediment, a triangular space that forms the gable of a...
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Educational Technology Clearinghouse: Clip Art Etc: Tomb of Atreus
The Tomb of Atreus also known as the Treasury of Atreus is a tomb located in Mycenae, Greece built between 1250 and 1300 B.C. The face of the tomb consists of columns and has a triangle above the doorway. The tomb has an interior that is...
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Famous Trials: The Triangle Shirtwaist Fire Trial, 1911
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.
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A 30 60 90 Degree Triangle
The formulas for 45-45-90 and 30-60-90 triangles and the use of the Pythagorean theorem to prove the formulas.
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A 45 45 90 Degree Triangle
The formulas for 45-45-90 and 30-60-90 triangles and the use of the Pythagorean theorem to prove the formulas.
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Science Kids: Science Images: Equilateral Triangle
This picture shows an equilateral triangle, a three sided regular polygon with internal angles of 60 degrees and sides of equal length.
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Educational Technology Clearinghouse: Maps Etc: Chart of Early Virginia, 1632
A map of the lower James River, Chesapeake Bay, and Accomack County, showing the early English settlements in the Virginia Colony in 1632. The map is keyed to show the extent of English settlement at the time, and shows the Native...
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Educational Technology Clearinghouse: Clip Art Etc: A Babylonian Map of the World
A tablet of dark brown clay, much injured, dating from the 8th or 7th century B.C. The two large concentric circles indicate the ocean, or, as it is called in the cuneiform writing between the circles, the 'Briny Flood.' Beyond the ocean...
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Educational Technology Clearinghouse: Maps Etc: New Hampshire, 1903
A map from 1903 of New Hampshire showing the capital of Concord, counties and county seats, principal cities and towns, railroads, rivers, and mountain ranges. "New Hampshire, one of the New England States of the American Union, lies...
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Educational Technology Clearinghouse: Maps Etc: North China, 1971
" North China includes the densely populated and intensively cultivated North China Plain, the loess-covered uplands of Shansi, northern Shensi, and eastern Kansu, and the sparsely populated, semiarid steppes of Inner Mongolia....
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Platonic Realms: The Mathematical Art of m.c. Escher
Math Academy Online presents a great M.C. Escher (1898-1972 CE) site for connecting the arts and mathematics. As even Escher said, "For me it remains an open question whether [this work] pertains to the realm of mathematics or to that of...
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Eternal Egypt: Bab Al Qarrafa
Bab Al-Qarrafa is a vaulted passage. At the end of the vault radius there are segments of spherical triangles.
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Science Kids: Science Images: Missing Shapes Illusion
These are two simple missing shape optical illusions shown in black and white. The existence of a white triangle can easily be imagined in the top image while your brain can also easily create the existence of a white sphere in the lower...
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Eternal Egypt: Lamp Decorated With Centaur
A centaur, a mythological creature with the body of a horse and the head and torso of a human, is painted on the lamp and the sides are decorated with triangles. The lamp has two openings for oil and a solid handle, which is partly broken.
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Educational Technology Clearinghouse: Clip Art Etc: Lion Gate at Mycenae
The main entrance through the circuit wall was made grand by the best known feature of Mycenae, the Lion Gate, through which passed a stepped ramp leading past circle A and up to the palace. The Lion Gate was built in the form of a...
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Educational Technology Clearinghouse: Maps Etc: Newfoundland, 1903
A map from 1903 of the Canadian province of Newfoundland, showing cities, towns and ports, railways, lakes, rivers, and coastal features, as well as the coastal districts of White Bay, Bonne Bay, Bay of Exploits, Bonavista Bay, St....
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Science Kids: Science Images: Snow Warning Sign
This snow warning sign is used to alert people of possible snow dangers in the area. This risk can be particularly dangerous for those traveling in vehicles. The sign features a black snowflake inside a red triangle.
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Eternal Egypt: Panel With Eagle
This oblong panel has a circular top, over which is a gable of two connected triangles, separated by a decoration in the form of dots.
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Science Kids: Science Images: Slippery Surface Warning Sign
This slippery surface warning sign is used to alert drivers of an impending danger that could end in an accident. The inside of the sign shows a car slipping around on a surface such as ice while the outside is framed by a large red...
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