It's Edge.
That is incorrect.
The corners formed by two adjacent lines are the vertex.
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Vertex of a triangle is any of its 3 corners and the plural of vertex is vertices
A median of a triangle is a line from a vertex of the triangle to the midpoint of the side opposite that vertex.
Altitude: The altitude of a triangle is a perpendicular segment that connects a vertex and its opposite side. Let's construct the altitude of a triangle using a new triangle.
Always for it to be a complete triangle with three altitudes it would have to intersect at a vertex.
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