How many different triangles are in the figure below? Extension: Note that this is a 10 by 10 by 10 triangular grid. What if it were an N by N by N triangular grid, then how many triangles? Additional ...

Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or ...

LOUISVILLE, Ky. (WDRB) -- A southern Indiana math coach is using the Internet and her bathtub to sharpen students' math skills while they're stuck at home during the COVID-19 pandemic. Megan Bliss, a ...