Question

what is a vertex and orthocentre

Answer 1

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VERTEX
In geometry, a vertex (plural: vertices or vertexes) is a pointwhere two or more curves, lines, or edges meet. As a consequence of this definition, the point where two lines meet to form an angle and the corners of polygons and polyhedraare vertices

ORTHOCENTRE
The orthocenter is the point where the three altitudes of a triangle intersect. A altitude is a perpendicular from a vertex to its opposite side.

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Answer 2

The orthocenter is the point where all three altitudes of the triangle intersect....
and vertex...:Vertex typically means a corner or a point where lines meet. ...
hope it will help....