Difference between revisions of "2003 AMC 12A Problems/Problem 13"
Danielguo94 (talk | contribs) (→See Also) |
(→Problem) |
||
Line 1: | Line 1: | ||
== Problem == | == Problem == | ||
− | The [[polygon]] enclosed by the solid lines in the figure consists of 4 [[congruent]] [[square (geometry) | squares]] joined [[edge]]-to-edge. One more congruent square is | + | The [[polygon]] enclosed by the solid lines in the figure consists of 4 [[congruent]] [[square (geometry) | squares]] joined [[edge]]-to-edge. One more congruent square is attached to an edge at one of the nine positions indicated. How many of the nine resulting polygons can be folded to form a [[cube (geometry) | cube]] with one face missing? |
[[Image:2003amc10a10.gif]] | [[Image:2003amc10a10.gif]] |
Revision as of 11:57, 4 July 2011
Problem
The polygon enclosed by the solid lines in the figure consists of 4 congruent squares joined edge-to-edge. One more congruent square is attached to an edge at one of the nine positions indicated. How many of the nine resulting polygons can be folded to form a cube with one face missing?
Solution
Let the squares be labeled ,
,
, and
.
When the polygon is folded, the "right" edge of square becomes adjacent to the "bottom edge" of square
, and the "bottom" edge of square
becomes adjacent to the "bottom" edge of square
.
So, any "new" square that is attatched to those edges will prevent the polygon from becoming a cube with one face missing.
Therefore, squares ,
, and
will prevent the polygon from becoming a cube with one face missing.
Squares ,
,
,
,
, and
will allow the polygon to become a cube with one face missing when folded.
Thus the answer is .
See Also
2003 AMC 12A (Problems • Answer Key • Resources) | |
Preceded by Problem 12 |
Followed by Problem 14 |
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 12 Problems and Solutions |