Of Nine Pieces.
Fig. 89.
Of Ten Pieces.
Fig. 90.
First cut the square into pieces of the three shapes shown, four of A, four of B, and two of the small one C. The formation of a perfect square with them will be a difficult task.
Of Twenty Triangles.
Begin by placing four triangles at the sides of a square of four triangles, when the rest of the shape can be filled in readily.