Lines that cross each other at 90 degrees are perpendicular lines.
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The lines that cross at a 90 degree angle are called Perpindicular lines.
A perpendicular are two straight lines that cross each other at a right angle, and the angle perpendicular position is 90 Degrees L .
Perpendicular Lines are two straight lines that intersect to form a 90 degrees or an right angle.Regards,
A right angle which is ninety degrees or 360 degrees which is a revolution.
An angle greater than 90 degrees would be considered an "obtuse" angle. Once you get to 180 they are considered "Straight" lines. Once you pass 180 degrees they are called "Reflex" angles.