Geometrical shapes and solids are all around us. Look out the window and you may see angles, triangles, squares, or circles. In ancient times, people built and interacted with a variety of objects and structures. The shapes and solids that recurred most often were named and their properties were discovered. In this section, you will explore the properties of these two- dimensional shapes.

To learn more, visit the materials linked below.

Subpages (1): Quadrilaterals