: the intersection of the three lines that can be drawn flowing from the three corners of a triangle to a point along the opposite side where each line intersect that side at a 90 degree angle; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle
the intersection of the three lines that can be drawn flowing from the three corners of a triangle to a point along the opposite side where each line intersect that side at a 90 degree angle; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle
The orthocenter is the intersection of the lines containing the altitudes of the triangle
That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect
The point of concurrency of the three altitudes (or of the lines through the altitudes) of a triangle (Lesson 3 7)