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# In triangle ABC, point X is on side BC such that AX = 13, BX = 10, CX = 4

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In triangle ABC, point X is on side BC such that AX = 13, BX = 10, CX = 4 ,and the circumcircles of triangles ABX and ACX have the same radius. Find the area of triangle ABC.

I have had a look at similar questions to this, and I was unable to figure it out.

Aug 21, 2023

#1
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Since the circumcircles of triangles ABX and ACX have the same radius, then triangle AXB is similar to triangle ACX.

Let r be the radius of the circumcircles of triangles AXB and ACX. Then the circumradius of triangle ABC is also r.

By Power of a Point,

\begin{align*} (AX)^2 &= r^2 + 10^2 \ (CX)^2 &= r^2 + 4^2 \ (BX)^2 &= r^2 + (AX - CX)^2 \ &= r^2 + 13^2 - 8^2 \ &= r^2 + 144 - 64 \ &= r^2 + 80. \end{align*}Adding these equations, we get

[279 = 3r^2.]Then r=93​.

The area of triangle ABC is

[\frac{1}{2} \cdot BC \cdot r = \frac{1}{2} \cdot 10 \cdot \sqrt{93} = \boxed{5 \sqrt{93}}.]

Aug 21, 2023
#2
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I am afraid that that answer is incorrect.

Aug 22, 2023