Copyright 1998-20040 Cynthia LaniusPolyominoescan be organized by their number of squares. Examine the table below.

No. of Squares 1 2 3 &

Notice that there is only one way to make a figure with one or two squares, but there are two ways to form a

As we saw earlier, there are 5 differenttriomino.(4 squares).tetrominoes

No. of Squares 4

Now one other thing you need to know - a reflection, rotation or translation of a piece isnota different piece. For example, the two pieces below are the same piece, just flipped over. For more on transformations seeby Susan Addington and Suzanne Alejandre.Types of Symmetry In the Plane

Assignment: Explorationare polyominoes with 5 squares.PentominoesHow many differentExplore by drawing them on square grid paper. You may print out this grid paper if you need it.pentominoeswould there be?

Next: see the pentominoes

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