reverse-pyramid-and-right-angled-triangle

Write a C program to print reverse pyramid and right angled triangle as follows.

1   2   3   4   5   6   7   8   9
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1   2   3   4   5   6   7   8   9
    4   6   8  10  12  14  16  18
        9  12  15  18  21  24  27
           16  20  24  28  32  36
               24  29  34  39  44
                   36  42  48  54
                       49  56  63
                           64  72
                               81