Activity
Maths Challenge

Maths challenge.net: Shaded Area

For Students 3rd - 8th
A "one star" geometry problem that requires problems solving skills and exercises ones visual-spatial abilities.
Activity
University of Cambridge

University of Cambridge: Nrich: Games the Triangle Game

For Students 4th - 7th
Use this game to improve your knowledge and understanding of triangles and naming vertices. Just read and follow the instructions! [Requires Java.]