A good puzzle is
that which the gentleman in the
illustration is showing to his friends.

He has simply cut out of paper
an equilateral triangle—that is, a triangle with all its
three sides of the same length.

He proposes that it shall be cut into
five pieces in such a way that they will fit together and form either
two or three smaller equilateral triangles, using all the material in
each case.

Can you discover
how the cuts should be made?

Remember that when
you have made your five pieces,
you must be able, as desired, to put them together to form either the
single original triangle or to form two triangles or to form three
triangles—all equilateral.

See answer