1. National Council of Teachers of Mathematics
The Geometry Standard
Principles and Standards for School Mathematics
National Council of Teachers of Mathematics
2000
Master 14-1: The Geometry Standard

2.  Instructional programs from pre-kindergarten through grade 12 should enable all students to:
Analyze characteristics and properties of two- and three-dimensional geometric shapes and develop mathematical arguments about geometric relationships. 
Specify locations and describe spatial relationships using coordinate geometry and other representational systems.
Master 14-1: The Geometry Standard

3.  Instructional programs from pre-kindergarten through grade 12 should enable all students to:
Apply transformations and use symmetry to analyze mathematical situations
Use visualization, spatial reasoning, and geometric modeling to solve problems
Master 14-1: The Geometry Standard

4. Geoboard Quadrilaterals
Mark off a 3 by 3 section on your geoboard. All your exploration will be done on these 9 pegs.
How many non-congruent quadrilaterals can you form?
Use your geoboard to explore and then record your discoveries on geoboard recording paper.
Master 14-2: Geoboard Quadrilaterals

5. Geoboard Quadrilaterals
Compare your set of quadrilaterals with others to find those you may have missed.
Can you categorize the quadrilaterals in any way? How?
Master 14-2: Geoboard Quadrilaterals