How Many Triangles Are There?

​
number of divisions
19
Most of my students want to see the answer immediately. I decided to give them that and asked them to figure out systematically how to get the answer.

External Links

Triangle (Wolfram MathWorld)
Triangle Tiling (Wolfram MathWorld)

Permanent Citation

Abraham Gadalla
​
​"How Many Triangles Are There?"​
​http://demonstrations.wolfram.com/HowManyTrianglesAreThere/​
​Wolfram Demonstrations Project​
​Published: March 7, 2011