Difference between revisions of "2001 AMC 10 Problems/Problem 5"
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The ones with lines over the shapes have at least one line of symmetry. Counting the number of shapes that have line(s) on them, | The ones with lines over the shapes have at least one line of symmetry. Counting the number of shapes that have line(s) on them, | ||
| − | we find <math> \boxed{\textbf{(D)} | + | we find <math> \boxed{\textbf{(D)}\ 6} </math> pentominoes. |
== Solution == | == Solution == | ||
Revision as of 13:28, 16 March 2011
Problem
How many of the twelve pentominoes pictured below at least one line of symmetry?
Solution
Here is the picture: http://www.artofproblemsolving.com/Forum/download/file.php?id=6659&&mode=view
The ones with lines over the shapes have at least one line of symmetry. Counting the number of shapes that have line(s) on them,
we find 
pentominoes.
