Graphs of points, lines, line segments, rays and angles. Good description.
Math.com
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A helpful scientific calculator that runs in your web browser window.
Holt Online Learning
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Definition and properties of a decagon
Math Open Reference
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This webpage gives a brief look at 3-D rectangular (Cartesian), cylindrical and spherical coordinate systems. There is also a "Learn more by exploring tutorial" link that demonstrates how to plot a point in the rectangular coordinate system.
Electron 9
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This provides on of the few online functions to interactively graph 3D coordinates.
Mathlets
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Definition and properties of a dodecagon
Math Open Reference
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Formula and description of the volume of a cylinder.
Math Open Reference
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An interactive applet that allows you to see the effects of changing the coeeficients in a cubic function using sliders
Math Open Reference
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An interactive, Web-based tutorial that demonstrates how 3D coordinates work.
University of Tennessee
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This page shows a point plotted in the (+, +, +) octant in a 3-D coordinate system.
Colorado University
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