Difference between revisions of "1992 AIME Problems/Problem 11"

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== See also ==
 
== See also ==
* [[1992 AIME Problems/Problem 10 | Previous Problem]]
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{{AIME box|year=1992|num-b=10|num-a=12}}
  
* [[1992 AIME Problems/Problem 12 | Next Problem]]
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[[Category:Intermediate Geometry Problems]]
 
 
* [[1992 AIME Problems]]
 

Revision as of 15:00, 11 March 2007

Problem

Lines $l_1^{}$ and $l_2^{}$ both pass through the origin and make first-quadrant angles of $\frac{\pi}{70}$ and $\frac{\pi}{54}$ radians, respectively, with the positive x-axis. For any line $l^{}_{}$, the transformation $R(l)^{}_{}$ produces another line as follows: $l^{}_{}$ is reflected in $l_1^{}$, and the resulting line is reflected in $l_2^{}$. Let $R^{(1)}(l)=R(l)^{}_{}$ and $R^{(n)}(l)^{}_{}=R\left(R^{(n-1)}(l)\right)$. Given that $l^{}_{}$ is the line $y=\frac{19}{92}x^{}_{}$, find the smallest positive integer $m^{}_{}$ for which $R^{(m)}(l)=l^{}_{}$.

Solution

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See also

1992 AIME (ProblemsAnswer KeyResources)
Preceded by
Problem 10
Followed by
Problem 12
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