[Illustration: Fig. 91.]
Cut up a square into four sets of two each, A a square, B and C a
triangle; three of the triangle D, and one each of E and F. Begin at the
left lower corner with A, to its top and right side place two of D, then
a large triangle C; a square is now made, one quarter of the large one.
The second square to the right requires but the two pieces, E and B. The
other half, from there only being five pieces to fit, will take but
little time and trouble.