There are two rectangles at play. One is slightly larger than the other by default, but the dimensions of both shapes can be adjusted in order to demonstrate all permutations of the interaction. The ...

Join Mrs. Markavich for a number talk with D.C. as we work on decomposing and composing to make a 10. We'll also explore what makes a shape a triangle, a rectangle, or a square. Episode 403/1st Grade ...

When I rushed, randomly guessing at perimeters of triangles and rectangles (geometry was never my favorite), Isabel, inferring from the speed of my keystrokes, wanted to know if I was bored.

Is Geometry a Language That Only Humans Know? Neuroscientists are exploring whether shapes like squares and rectangles — and our ability to recognize them — are part of what makes our species ...