Make three equilateral triangles with six matches. Of course, two can be
made with five matches; but then there is one over, and how to make a
third triangle with only one match is a puzzler. It is as easy as
possible. Make a triangle with three matches, and stand the other three
upon end inside the triangle in the form of a tripod (Fig. 10).
[Illustration]
Fig. 10.
Here is another triangular puzzle. With five matches form two
equilateral triangles. Tell the company they are to remove three
matches; then add two and make two more equilateral triangles. This is
only a "sell." You do not say where the two matches are to be added. You
add them to the three removed, and form the same figure over again (Fig.
11).
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Fig. 11.