Honors Geometry - Unit 3: Parallel and Perpendicular Lines and Planes

Vocabulary flashcards defining key terms related to parallel and perpendicular lines, planes, transversals, angle relationships, and coordinate geometry.

Parallel Lines

Coplanar lines that do not intersect.

Parallel Planes

Planes that do not intersect.

Skew Lines

Lines that do not intersect and are not coplanar.

Transversal

A line that intersects two or more coplanar lines at distinct points.

Corresponding Angles

Angles in matching positions relative to two lines and a transversal.

Alternate Interior Angles

Nonadjacent angles inside two lines that lie on opposite sides of a transversal.

Alternate Exterior Angles

Nonadjacent angles outside two lines that lie on opposite sides of a transversal.

Consecutive Interior Angles

Angles inside two lines that lie on the same side of a transversal.

Paragraph Proof

A format of proof written as narrative sentences explaining the logic step-by-step.

Distance from a Point to a Line

The length of the perpendicular segment from the point to the line.

Slope

The steepness of a line represented as the ratio of vertical change (rise) to horizontal change (run).

Parallel Slopes

Equal slopes possessed by non-vertical parallel lines in coordinate geometry.

Perpendicular Slopes

Slopes of non-vertical perpendicular lines that are negative reciprocals of each other, having a product of $-1$.