The mathematical symbol used is ⊥. So AB ⊥ CD means the line AB is perpendicular to the line CD.
The answer is B : Perpendicular
Parallel lines are lines that never intersect as or do not meet so this is not the case. Skew lines are lines that neither intersect nor they are parallel. This are lines that are in separate planes in space so they never touch. Adjacent lines are lnes that meet at a specific point , but can form any type of angle. Perpendicular lines are lines that cross and form 4 right angleso rangles of 90 degrees so this is the answer,
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Lines meeting at right angle.
Right anglesIn geometry, the property of being perpendicular is the relationship between two lines which meet at a right angle that is 90 degrees. To lines are said to be perpendicular, if they meet at 90 degrees that is the angle between them is 90 degrees.A line is said to be perpendicular to another line if the two lines intersect at a right angle.If line L is perpendicular to Line M, then it can be written as If two lines are perpendicular, then the product of slopes of the two lines is equal to -1.