Answer:
orthocenter
Step-by-step explanation:
The red segment is an altitude of the triangle, as are the two legs. The intersection point of the altitudes is the orthocenter.
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This is basically a vocabulary question.
- altitude - the perpendicular segment from a vertex to the opposite side (or its extension)
- median - the segment joining a vertex with the midpoint of the opposite side
- centroid - the point where medians meet
- orthocenter - the point where altitudes meet
