The figure below shows a “size 3” equilateral triangle divided into 9 “size 1” equilateral triangles. The figure has 6 upward facing and 3 downward facing “size 1” equilateral triangles, 3upward facing and no downward facing “size 2” triangles and 1 upward facing “size 3” triangle. It has a total of 13 equilateral
triangles of all sizes
1.13
2.14
3.36
4.16

• Answer is already given.
  
  Total 13 equilateral triangles.
  What is the question ?
• 12 years agoHelpfull: Yes(8) No(4)