Orthocentre of a triangle is a point on which all the altitudes of the triangle meet. It will be inside the triangle if the triangle is acute i.e. angles of the triangle are less than 90°
Orthocenter of a triangle means a point where all the altitudes meet. altitudes is a perpendicular bisector meaning to say that it divides the triangle from the vertex to the opposite line segment dividing as perpendicular.
the point can be marked as any capital letter other than the vertex of the triangle

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