Definiton and equation for a vertical line in coordinate geometry
Math Open Reference

Definition of a line segment when the defining points are on the coordinate plane
Math Open Reference

Area and perimeter of a rectangle (coordinate geometry)
Math Open Reference

Definiton and properties of a rectangle (coordinate geometry)
Math Open Reference

An animated demonstration showing how to use a protractor to measure an angle
Math Open Reference

How to draw an isosceles triangle given the base and altitude with compass and straightedge
Math Open Reference

How to draw an isosceles triangle with compass and straightedge
Math Open Reference

An animated demonstration showing how to use a protractor to draw an angle
Math Open Reference

How to copy a triangle with compass and straightedge
Math Open Reference

Congruent triangles  all three sides equal. SSS
Math Open Reference
