take three match for each triangle
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Answer: Mathematically, it is impossible to add five matches to six matches to result in nine matches.Logically, however, you can add five matches to six matches to make nine if one match is on fire, then you set that match on another match, and eventually both of those matches that were on fire burn themselves into ashes, leaving you with only nine unlit matches left.Answer: You lay out the 11 matches so they spell the word NINE.
Nine, as a n-gon can be cut in n-2 triangles.
Because the sum of the sides of three triangles is nine... Placing three triangles together so they all touch effectively removes four of the total number of sides - leaving five.
you cant.
A nine sided shape has 7 triangles