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Interactive Geometry Dictionary—Lines
Overview of Lines

Lines and points are the two most fundamental structures of geometry. There are many special lines in geometry that are singled out for their interesting properties. Many of these lines are included in this Interactive Geometry Dictionary. You can use the Interactive Math Tools that accompany each definition to explore the definitions of the lines and some of their properties. Just click on any of the lines given below.

Type of Line
Angle bisector   Perpendicular lines
Euler line   Ray
Line   Segment
Median   Simson line
Perpendicular bisector    

 

References and Credits
National Council of Teachers of Mathematics Illuminating a New Vision for School Mathematics MarcoPolo Education Foundation
Illuminations is a partnership between the National Council of Teachers of Mathematics and the MarcoPolo Education Foundation
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This page last updated: April 15, 2003


The mission of the National Council of Teachers of Mathematics is to provide the vision and leadership necessary to ensure a mathematics education of the highest quality for all students. The NCTM Illuminations Web site is devoted to providing Internet resources to improve the teaching and learning of mathematics in grades pre-K through 12. The views expressed or implied on this Web site, unless otherwise noted, should not be interpreted as official positions of the Council.