perpendicular
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Two perpendicular lines will meet in a right angle (90 degrees) if they exist on a flat plane.
A right angle is an angle that measures exactly 90 degrees on the protractor, wheres perpendicular is simply a word which means 2 lines that meet at one end, the opposite of parallel, which means 2 or more lines that don't meet at the end.
Not normally but as an isosceles right angle triangle it will have perpendicular lines that meet at 90 degrees.
vertex
yes