2005 AIME I Problems/Problem 15
Problem
Triangle has
The incircle of the triangle evenly trisects the median
If the area of the triangle is
where
and
are integers and
is not divisible by the square of a prime, find
Solution
![[asy] size(300); pointpen=black;pathpen=black+linewidth(0.65); pen s = fontsize(10); pair A=(0,0),B=(26,0),C=IP(circle(A,10),circle(B,20)),D=(B+C)/2,I=incenter(A,B,C); path cir = incircle(A,B,C); pair E1=IP(cir,B--C),F=IP(cir,A--C),G=IP(cir,A--B),P=IP(A--D,cir),Q=OP(A--D,cir); D(MP("A",A,s)--MP("B",B,s)--MP("C",C,N,s)--cycle); D(cir); D(A--MP("D",D,NE,s)); D(MP("E",E1,NE,s)); D(MP("F",F,NW,s)); D(MP("G",G,s)); D(MP("P",P,SW,s)); D(MP("Q",Q,SE,s)); MP("10",(B+D)/2,NE); MP("10",(C+D)/2,NE); [/asy]](http://latex.artofproblemsolving.com/e/b/b/ebb5c6eb90edb59c2c2fc2cf3dfef0dcf818f4f9.png)
Let ,
and
be the points of tangency of the incircle with
,
and
, respectively. Without loss of generality, let
, so that
is between
and
. Let the length of the median be
. Then by two applications of the Power of a Point Theorem,
, so
. Now,
and
are two tangents to a circle from the same point, so
and thus
. Then
so
and thus
.
Now, by Stewart's Theorem in triangle with cevian
, we have
Our earlier result from Power of a Point was that , so we combine these two results to solve for
and we get
Thus or
. We discard the value
as extraneous (it gives us an equilateral triangle) and are left with
, so our triangle has sides cdot 18 \cdot 8 \cdot 2} = 24\sqrt{14}
24 + 14 = \boxed{038}$.
See also
2005 AIME I (Problems • Answer Key • Resources) | ||
Preceded by Problem 14 |
Followed by Last Question | |
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