The circumcentre is outside the triangle - next to the longest line.
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When the triangle is obtuse.
always
All triangles with an obtuse angle will have the circumcentre outside the boundary of the triangle.
The circumcenter of a triangle is equidistant from the vertices of a triangle.
Circumcenter, this is the center-point of a circle circumscribed around the triangle. If the triangle is obtuse, then this point is outside the triangle and if the triangle is a right triangle, then the point is the midpoint of the hypotenuse.