A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or irregular. If all the straight sides of a shape are the same length and interior angles are the ...

Build up to algebraic thinking by exploring this balance tool using shapes of unknown weight. Challenge yourself to find the weight of each shape in one of six built-in sets or a random set. Two other ...

Translation is the word we use when shapes move up, down, left and right. Let's start with a simple problem. We're going to move the furniture in Boo's bedroom around using translation.