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!