It is important to know terminology when learning math. The Vertex is the point where two lines meet and form and angle.
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Lines don't have endpoints, they extend indefinitely. Two line segments with a common endpoint form an angle.
90 degrees
Intersecting, perpendicular.
An intersecting line
Perpendicular is mostly used to describe Shapes and their properties. It means when two lines meet up at a 90 degrees right angle. It might be an X or a T when you look at it. Like the example shown below:------------------------------------lllllSo that isn't a good drawing, but it does show you the meaning of perpendicular!