A [b]nine-point circle[/b] contains 3 [i]midpoints[/i] ([i]D, E, F[/i]), 3 [i]Euler points[/i] ([i]N, O, P[/i]), and 3 [i]feet of altitudes[/i] ([i]K, L, M[/i]) of a triangle ([Triangle ABC]).[br]The [b]nine-point circle[/b] is also [i]tangent[/i] to the [i]inscribed circle[/i] and [i]excircles[/i] of the triangle.[br][br]Drag any of the vertices of the triangle to verify theses properties of the [b]nine-point circle[/b].[b][/b]