Here are several geometry problems and investigations. The geometry content of these pages target the high school level.
Polygon Area: Create polygons on a grid to determine their area. Four Activites.
Complementary Angles: Explore these inside a triangle.
Sum of the angles of a Triangle: Move the figure and discover the relationships.
Supplementary Angles: Explore these inside a quadrilateral.
Vertical Angles: What are these? What are the relationships?
The Sides of a Triangle Relationship: