Pentomino

A geometric shape comprised of five (greek pente) identical squares. Compare to domino (two squares), or tetromino (four squares).

A standard pentomino puzzle is to arrange a set of the twelve possible shapes into a rectangles without holes: 3x20, 4x15, 5x12, 6x10.

The shapes look like this:

  _ _ _ _ _
 |_|_|_|_|_|

  _ _ _ _        _ _ _ _
 |_|_|_|_|      |_|_|_|_|
 |_|                  |_|

  _ _ _            _ _ _
 |_|_|_|_        _|_|_|_|
     |_|_|      |_|_|

  _ _ _            _ _ _
 |_|_|_|          |_|_|_|
 |_|_|              |_|_|

  _                    _
 |_|_ _            _ _|_|
 |_|_|_|          |_|_|_|
     |_|          |_|

  _ _ _
 |_|_|_|
 |_| |_|

  _
 |_|_ _
 |_|_|_|
 |_|

    _
  _|_|_
 |_|_|_|
   |_|