National Council of Teachers of Mathematics
The Math Forum: Lines and Slope: Chameleon Graphing
Join Joan the chameleon in an exploration of lines and slope. You'll be drawing lines, calculating slope, using equations and more!
Curated OER
Science Kids: Science Images: Parallel Lines Cafe Wall Illusion
This famous optical illusion makes the parallel horizontal lines appear to be bent when in fact they are straight. It was originally noticed amongst the tiles of a cafe wall and can now be seen in architecture such as on a large building...
Northeast Parallel Architectures Center, Syracuse University
Npac Reu Program: Slope
This Northeast Parallel Architecture Program, Syracuse University site explains and illustrates by using the changes in the values of x and y you can determine the slope of a line.
Curated OER
Eternal Egypt: Head of Senusert the First
The head was carved in the style of the Eleventh Dynasty with small slanting eyes and horizontal eyebrows, a straight mouth surrounded by an incised line, and the alternate dark and light bands of the royal head cloth carved in radiating...
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: Nevada, 1903
A map from 1903 of Nevada showing counties and county seats, principal cities and towns, mountain ranges, and rivers. "Nevada, one of the most western of the States of the American Union, was formed from a portion of the territory...
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
Y = (2/3)X 4
This lesson on slope explains the slope concepts, demonstrates how to use the slope formula, shows how to find slope in horizontal and vertical lines, and how to use slope to find whether the lines through the pairs of points are...
Curated OER
Y = 2x + 3
This lesson on slope explains the slope concepts, demonstrates how to use the slope formula, shows how to find slope in horizontal and vertical lines, and how to use slope to find whether the lines through the pairs of points are...
Curated OER
Etc: Maps Etc: Europe on a Conic Projection, 1915
A map of Europe on a simple conic projection showing straight meridians or lines of longitude, and concentric circular parallels or lines of latitude.
Curated OER
Educational Technology Clearinghouse: Maps Etc: Pre Colonial Africa, 1872
A map of Africa showing the continent prior to the Berlin Conference of 1885, when the most powerful countries in Europe at the time convened to make their territorial claims on Africa and establish their colonial borders at the start of...
Curated OER
Educational Technology Clearinghouse: Maps Etc: Bear Valley Region, 1911
A map of a portion of the San Bernardino Mountains near Big Bear Lake in 1911. The map is based on the USGS San Gorgonio quadrangle, with contour intervals of 500 feet. "Bear Valley and the adjacent country exhibit the subdued relief...
Curated OER
Unesco: Russian Federation: Citadel, Ancient City and Fortress Bldgs of Derbent
The Citadel, Ancient City and Fortress Buildings of Derbent were part of the northern lines of the Sasanian Persian Empire, which extended east and west of the Caspian Sea. The fortification was built in stone. It consisted of two...
Curated OER
Science Kids: Science Images: Zollner Illusion
The Zollner illusion is named after German astrophysicist Johann Karl Friedrich Zollner. Although the black lines appear to not be parallel, in reality they are.
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