January 18, 2011

Problem of the Week

for Tuesday, January 18, 2011

An equilateral triangle can be divided into four smaller equilateral triangles like this:

Divide an equilateral triangle into:

1) 9 equilateral triangles

2) 6 equilateral triangles

3) 7 equilateral triangles

Describes the set of numbers of smaller equilateral triangles that an equilateral triangle cannot be broken into. NOTE: The smaller triangles don't have to all be the same size!

Winners of the triangle challenge