Make an hexahedron in the form of a triangular dipyramid. See link for images.
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you cant.
take three match for each triangle
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.
please tell me
It means nine squares in tic tac toe