Definition and properties of a cube.
Math Open Reference

Finding the midpoint of a line segment given the coordinates of the endpoints
Math Open Reference

Definition of 'Angle Bisector' and a general discussion of bisection. Link to 'line bisector'
Math Open Reference

Definition of collinear points  three or more points that lie in a straight line
Math Open Reference

Great (and short)Powerpoint Presentation on Points, Lines, and Planes.
DocStoc

Definition of a transversal. A line that cuts across two or more (usually parallel) lines. Also perpendicular transversal
Math Open Reference

The Protractor described. Dual scales, baseline and origin.
Math Open Reference

A problem involving the calculation of spacecraft orbits.
Math Open Reference

Definition of a point
Math Open Reference

Perpendicular definition: Perpendicular simply means 'at right angles'. A line is perpendicular to another if they meet at 90 degrees.
Math Open Reference
