Stage: 3 and 4 Challenge Level: 
Can you construct elegant procedures that will draw the squares and triangles and then this basic unit for a family of 'floor coverings'?
Can you construct procedures for tiling patterns based on this set of tiles?
Others have called them patches. Can you see why?
Squares. Equilateral triangles. Working systematically. Sequences. Tessellations. Practical Activity. Logo. Recursion. Angle properties of shapes. Investigations.
Published November 1999.
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