Matchstick Triangles

Author:James R Olsen

Use the app to figure out the number of triangles (of any size) in a triangular matchstick arrangement of side n. The example shown has a side of 5 (n=5). Can you generalize?

New Resources

Congruent Figures
Squaring a Rectangle (PST Version)
Congruent Sides & Angles in △s: Exploration
Linear Equation Graphs: Thin Slice
Segment Addition Postulate (Mild Questions)

Discover Resources

ILLUSION 1
More about ellipses
Graniastosłupy
H Reflected Point
Curvas de Nível

Discover Topics

Vectors 3D (Three-Dimensional)
Power Functions
Special Points
Geometric Mean
Matrices