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

Area of a parallelogram. Definition and formula
Math Open Reference

Definition of the midpoint of a line segment.
Math Open Reference

Definition of locus  the shape formed by a set of points that satisfy given crtiteria
Math Open Reference

Definition of a line segment, a line linking two points.
Math Open Reference

Definition and properties of a linear pair of angles  two angles that are adjacent and supplementary
Math Open Reference

An interactive applet that allows you to graphically see the effects of changing the coeeficients in a linear function using sliders
Math Open Reference
