18. |
Cover an area of 45 squares in a 5 by 9 rectangle. |
19. |
Fill a rectangle of area 50 squares.
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20. |
Fill a rectangle of area 55 squares.
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Using all 12 pentominoes to fill a rectangle can be done in 3 different ways.
As a 3 by 20 rectangle; as a 5 by 12 rectangle; as a 6 by 10 rectangle.
The 3 by 20 was done in problem #16 (above).
One solution to the 5 by 12 (from among several thousand) is shown below.
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21. |
Find a different way to fill the 5 by 12 rectangle. |
22. |
Use the full set of 12 pentominoes to fill a 6 by 10 rectangle. |