2001 AMC 10 Problems/Problem 5: Difference between revisions
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== Problem == | == Problem == | ||
How many of the twelve pentominoes pictured below at least one line of symmetry? | How many of the twelve pentominoes pictured below have at least one line of symmetry? | ||
<math> \textbf{(A)}\ 3 \qquad \textbf{(B)}\ 4 \qquad \textbf{(C)}\ 5 \qquad \textbf{(D)}\ 6 \qquad \textbf{(E)}\ 7 </math> | <math> \textbf{(A)}\ 3 \qquad \textbf{(B)}\ 4 \qquad \textbf{(C)}\ 5 \qquad \textbf{(D)}\ 6 \qquad \textbf{(E)}\ 7 </math> | ||
Revision as of 19:31, 1 January 2018
Problem
How many of the twelve pentominoes pictured below have at least one line of symmetry?
Solution
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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,
we find 
pentominoes.
See Also
| 2001 AMC 10 (Problems • Answer Key • Resources) | ||
| Preceded by Problem 4 |
Followed by Problem 6 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
| All AMC 10 Problems and Solutions | ||
These problems are copyrighted © by the Mathematical Association of America, as part of the American Mathematics Competitions. Error creating thumbnail: Unable to save thumbnail to destination
