Math - Geometry

• 3D Coordinates (In Space)
• Angles
• Arcs
• Area Formulas
• Classifying Triangles
• Compass/Protractor Constructions
• Congruent Triangles
• Deductive Reasoning
• Dilations
• Geometric Mean
• Geometric Probability
• Graphing Linear Equations
• Inscribed Angles
• Intro to Trigonometry
• Line
• Loci and Transformations
• Mappings (Tessellations)
• Networks
• Pairs of Angles
• Parallels
• Parallels and Transversals
• Parts of Circles
• Planes
• Points
• Polygon Angles
• Polygon Parts
• Polygons and Polyhedra
• Prisms
• Proofs
• Pyramids and Cones
• Quadrilaterals
• Rays/Angles
• Reflections
• Right Triangles
• Rotations
• Segments
• Similar Polygons
• Similar Triangles
• Space
• Statements
• Surface Area Formulas
• Tangents
• Translations
• Triangle Centers
• Triangle Inequality
• Triangle Parts
• Triangle Segments
• Vectors
• Volume Formulas

Polygons and Polyhedra

Polygon Polygon definition and properties Math Open Reference

Parallel lines (2) Definition and properties of parallel lines Math Open Reference

Octagon octagon Math Open Reference

Nonagon Definition and properties of a nonagon (enneagon) Math Open Reference

Hexagon Definition and properties of a hexagon Math Open Reference

Heptagon Definition and properties of a heptagon Math Open Reference

Congruent Polygon Tests Four different ways to test if polygons are congruent. Math Open Reference

Area of a Regular polygon This is a great link to help find area, depending on whether you know the length of a side or the apothem. You can get a discussion of the various formulas and the page is also interactive which allows you to check and see if what you calculated is on target. Math Open Reference

Polyhedra Gallery Gives illustrations of the most basic and the most complex polyhedra Cool Math 4 kids