The nine-point-circle

Geometry Level 5

For a triangle with sides 13, 15 and altitude 12, find the radius of the circle that pass through the following points:

  • The midpoint of each side.

  • The foot of each altitude.

  • The midpoint of the line segment from each vertex to the orthocenter.

If the radius can be written as \(a + \dfrac{m}{n}\), where \(a,m\) and \(n\) are positive integers, \(m<n\) and \(m\) and \(n\) are coprime. Find \(a+m+n\).

Note: Assume the given altitude to be through the vertex common to both the given sides


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