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The lines that intersect to Form A right triangle are called Perpendicular Lines; the resulting meeting point of these two lines is called the vertex of the angle.
a point
I believe this is possibly called a vector. They begin at the same point, however, they do not run on the same plane, nor do the intersect. As I said, they do begin at the same point and form a triangle.
In geometry, two or more lines are said to be concurrent if they intersect at a single point. If they do not intersect at the single point they are non concurrent.