Too easy, evidently. 9,11, 13 can produce equilateral polygon pairs of minimum size with different shapes. Looking at 15 there is at least one other way of doing it (with 3 symmetrical arms) but that pair won't tile the plane, a third tile would be needed. Stuart

3/ Is the minimum m-sided equilateral polygon shape unique for given n?

Stuart

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End of math-fun Digest, Vol 110, Issue 3 ****************************************