Definition and properties of a cube.
Math Open Reference
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Finding the midpoint of a line segment given the coordinates of the endpoints
Math Open Reference
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Great (and short)Powerpoint Presentation on Points, Lines, and Planes.
DocStoc
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Great description on what points, lines, and angles are.
SparkNotes
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A helpful scientific calculator that runs in your web browser window.
Holt Online Learning
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The site gives a small applet exploring the relationship between circles centered at the origin, linear equations, and pythagorean triples.
Pythagorean Triples
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Definition of 'Angle Bisector' and a general discussion of bisection. Link to 'line bisector'
Math Open Reference
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This page discusses the different types of lines in geometry, including medians, bisectors, rays and more.
NCTM Illuminations
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Definition of collinear points - three or more points that lie in a straight line
Math Open Reference
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Definition of a transversal. A line that cuts across two or more (usually parallel) lines. Also perpendicular transversal
Math Open Reference
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