Unit 2: Parallel and Perpendicular: Vocab, Theorems, and Formu

Front

Parallel Lines

Back

Definition: Two lines in the same plane that never intersect and have the same slope. Symbol: ∥

Front

Skew Lines

Back

Definition: Lines that do not intersect and are not in the same plane (non-coplanar).

Front

Perpendicular Lines

Back

Definition: Two lines that intersect to form right angles (90°). Symbol: ⊥

Front

Perpendicular Bisector

Back

Definition: A line, segment, or ray that is perpendicular to a segment at its midpoint.

Front

Perpendicular Bisector Theorem

Back

Statement: If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of the segment.

Front

Converse of Perpendicular Bisector Theorem

Back

If a point is equidistant from the endpoints of a segment, then it lies on the perpendicular bisector.

Front

Transversal

Back

Definition: A line that intersects two or more lines (usually parallel) at distinct points.

Front

Corresponding Angles

Back

Definition: Angles that are in the same position on each line relative to the transversal.

Front

Alternate Interior Angles

Back

Definition: Non-adjacent angles that lie on opposite sides of the transversal and inside the two lines.

Front

Alternate Exterior Angles

Back

Definition: Non-adjacent angles that lie on opposite sides of the transversal and outside the two lines.