Here is a more analytic & systematic way of counting the triangles puzzle. Sundarraman shares his solution.

http://teachersofindia.org/sites/default/files/05-sundarraman_counting-triangles.pdf

**Download Document:**05-sundarraman_counting-triangles.pdf

Category:

Classroom Resources

Subject:

Mathematics

Board:

All boards

Grade/Standard:

Class 9-10

Class 11-12

License:

CC BY-NC-SA