Definition and properties of concentric circles
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Math Open Reference
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Definition of 'Perpendicular Bisector'
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Math Open Reference
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Definition of 'Line Bisector' and a general discussion of bisection. Link to 'angle bisector'
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Math Open Reference
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Definition of 'base' and the various different ways the word is used in geometry
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Math Open Reference
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Adjacent sides definition: Two lines that meet at a polygon vertex.
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Math Open Reference
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A Quiz on Coordinates and Lines
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SOS Math
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Great (and short)Powerpoint Presentation on Points, Lines, and Planes.
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DocStoc
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Great description on what points, lines, and angles are.
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SparkNotes
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This gives step by step instructions on constructing a line parallel to another line through a point includes a JavaSketchpad for interaction.
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To draw a line through a given external point parallel to a given line.
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This gives step by step instructions on constructing a perpendicular to a line through a point not on the line.
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To drop a perpendicular to a given line from a given external point.
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