Solution to: The Triangle

There are 18 solutions to this problem, when you leave out all rotations and mirror solutions. They are all listed below:

      1
    5   7
  9       6
2   4   8   3

      1
    5   8
  9       3
4   2   6   7

      1
    6   9
  8       4
2   5   7   3

      1
    6   9
  8       2
4   3   5   7

      1
    6   7
  8       3
5   2   4   9

      2
    4   7
  9       3
5   1   6   8

      2
    5   6
  9       4
3   1   8   7

      2
    6   9
  7       1
5   3   4   8

      2
    6   9
  8       1
3   4   5   7

      3
    2   6
  9       4
7   1   5   8

      3
    4   9
  8       1
5   2   6   7

      3
    4   7
  8       2
6   1   5   9

      3
    5   9
  6       1
7   2   4   8

      3
    5   8
  7       1
6   2   4   9

      4
    2   7
  9       3
5   1   8   6

      4
    3   9
  8       1
5   2   7   6

      7
    2   4
  6       3
8   1   5   9

      7
    3   6
  5       1
8   2   4   9

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