None.
Altitudes may coincide with the sides of a triangle but medians cannot. So every triangle must have 3 distinct medians.
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The median is a line from a vertex to the midpoint of the opposite line and an altitude is a line from a vertex to the opposite line which is perpendicular to the line. These are NOT the same thing in most triangles. The only time they could be the same is in an equilateral triangle.
The median of a triangle bisects its side
The altitude line is perpendicular to the base and bisects the apex of the isosceles triangle.
Any right triangle resting on a leg.