Geometry Vocabulary

A set of vocabulary flashcards covering basic geometric terms, line and angle relationships, and bisectors based on the lecture notes.

Vertical Angles

Two angles created by intersecting lines that only share a vertex and are congruent.

Linear Pairs

Two adjacent angles that create a line and always add up to $180^\circ$.

Point

A geometric location in space.

Line

A 1-dimensional geometric figure with 2 arrows that never end.

Plane

A 2-dimensional flat surface characterized by length and width, containing 3 non-collinear points.

Segment

A 1-dimensional section of a line with 2 endings.

Ray

A 1-dimensional part of a line with 1 ending.

Opposite Rays

Two rays that share an endpoint and go in opposite directions.

Angle

Two rays that share an endpoint, measured in degrees, that add up to $360^\circ$.

Distance

How far apart two things are; it is always positive and requires a label.

Congruent

Identical objects or figures with no difference in measurement.

Midpoint

A point that divides a segment into 2 equal or congruent parts and is always in the middle.

Bisect

To cut into 2 equal or congruent parts.

Perpendicular Bisector

A line, segment, or ray that cuts a segment into 2 equal parts at a $90^\circ$ angle.

Angle Bisector

A line, segment, or ray that cuts an angle into 2 equal parts.

Supplementary Angles

Two angles whose sum is always $180^\circ$.

Complementary Angles

Two angles whose sum is always $90^\circ$.