THE ACCOMMODATING SQUARE.
Cut out eight squares of cardboard; divide four of them into halves, cutting them from corner to corner, so that there are in all twelve pieces. The puzzle is to form a square with the twelve pieces. It is to be done as shown in the accompanying plan. The four squares and the eight triangular pieces are numbered respectively 1 to 4 and 5 to 12 (Fig. 16).
Fig. 16.—The Accommodating Square.
Fig. 17.—a, The Pieces. b, The Cross.