Lines don't have endpoints, they extend indefinitely. Two line segments with a common endpoint form an angle.
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It is important to know terminology when learning math. The Vertex is the point where two lines meet and form and angle.
junction
Edge
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!