A complete reference guide to coordinate geometry. It provides definitions and examples that enhance further explanation. Includes links to related topics.

This robust lesson plan for upper elementary and middle school grades introduces the concepts for lines, rays, line segments, and planes. Resources are linked to it and ready for your use.

In a coordinate proof, geometric statements using algebra and the coordinate plane.

This resource features information on the point-slope form in geometry. It provides a good definition, several examples, and information on various forms.

A ten question test for assessing measurement concepts of area and perimeter. Assessment is scored online and student scores are compared with other students who have taken the assessment. Great assessment tool.

A complete reference guide to horizontal lines. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.