Lines in Relation
Study how lines behave relative to one another, including parallel, perpendicular, skew, and transversal situations.
9 concepts in this topic
This category is about structure: how lines meet, how they stay apart, and how those patterns create angle facts that show up again and again in proofs and diagram questions.
Parallel Lines
Parallel lines stay the same distance apart and never intersect.
Perpendicular Lines
Perpendicular lines intersect to form right angles.
Skew Lines
Skew lines lie in different planes, are not parallel, and never meet.
Transversal Line
A transversal is a line that intersects two or more lines.
Corresponding Angles
Corresponding angles are in matching positions when a transversal crosses lines.
Alternate Interior Angles
Alternate interior angles lie between the lines on opposite sides of the transversal.
Alternate Exterior Angles
Alternate exterior angles lie outside the lines on opposite sides of the transversal.
Consecutive Interior Angles
Consecutive interior angles lie on the same side of the transversal between the lines.
Consecutive Exterior Angles
Consecutive exterior angles lie on the same side of the transversal outside the lines.