Difference between revisions of "Mock AIME 1 2006-2007 Problems/Problem 10"
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Given <math> \frac{r}{a}+\frac{r}{b}+\frac{r}{c}=\frac{m}{n} =\frac{20}{3}</math>, so <math>m+n=23</math>. | Given <math> \frac{r}{a}+\frac{r}{b}+\frac{r}{c}=\frac{m}{n} =\frac{20}{3}</math>, so <math>m+n=23</math>. | ||
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Latest revision as of 23:58, 24 April 2013
Problem
In ,
,
, and
have lengths
,
, and
, respectively. Let the incircle, circle
, of
touch
,
, and
at
,
, and
, respectively. Construct three circles,
,
, and
, externally tangent to the other two and circles
,
, and
are internally tangent to the circle
at
,
, and
, respectively. Let circles
,
,
, and
have radii
,
,
, and
, respectively. If
where
and
are positive integers, find
.
Solution
Radius , radius
, radius
and
, see picture.
Given , so
.