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

Congruent triangles  Why SSA does not work
Math Open Reference

Congruent triangles  Two sides and included angle. SAS
Math Open Reference

Polygons are congruent when all corresponding sides and interior angles are congruent.
Math Open Reference
