They cannot be picked up. A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they have. A three-dimensional (3D) shape is a solid ...

The value of pi lies between those two lengths. By doubling the number of sides of the hexagon to a 12-sided polygon, then a 24-sided polygon, and finally 48- and 96-sided polygons, Archimedes was ...

Zach’s design for the pond looks like a duck, but what is the name of the shape? Ada explains that the properties of the shape mean that it is a polygon, a closed shape with straight sides.