Sophia Learning
Sophia: Medians of a Triangle: Lesson 5
This lesson introduces the medians of a triangle. It is 5 of 6 in the series titled "Medians of a Triangle."
Shodor Education Foundation
Shodor Interactivate: Coloring Multiples in Pascal's Triangle
In this activity, the student can visually identify number patterns in Pascal's triangle by coloring multiples of a given number.
Sophia Learning
Sophia: Estimating the Area of a Circle: Lesson 4
This lesson explains how triangles and parallelograms can be used to estimate the area of a circle. It is 4 of 4 in the series titled "Estimating the Area of a Circle."
Curated OER
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.
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 1
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 1 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
Curated OER
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).
Curated OER
Top Triangle
This site explores the area of congruent triangles and how it is a difficult area to understand.
Curated OER
Bottom Triangle
This site explores the area of congruent triangles and how it is a difficult area to understand.
Curated OER
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.
Curated OER
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...
Curated OER
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...
Curated OER
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.
Curated OER
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.
Curated OER
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.
Curated OER
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.
Curated OER
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...
Curated OER
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...
Curated OER
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...
Curated OER
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....
Curated OER
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...
Sophia Learning
Sophia: More Difficult Pythagorean Theorem Examples: Lesson 3
This lesson will provide more advanced practice examples that apply the Pythagorean Theorem to solve for an unknown side of a right triangle. It is 3 of 5 in the series titled "More Difficult Pythagorean Theorem Examples."
Other
Personal Site: Adding Vectors
This personal site provides a diagram and description of the addition of vectors. The triangle law of addition and the parallelogram law are given.
Curated OER
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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