Geometry Unit 1 Vocabulary Flashcards

Basic Geometric Concepts

• Point: Represents a location, indicated by a capital letter; has no dimensions or thickness (0-dimensional).
• Line: Infinite collection of points extending indefinitely; characterized by being one-dimensional with no thickness.
• Plane: Flat surface extending infinitely in two directions; composed of an infinite set of points; has two dimensions and no thickness.
• Space: Three-dimensional context encompassing all points in geometry.

Relationships Among Points

• Collinear Points: Points situated on the same straight line.
• Noncollinear Points: Points that do not lie on the same straight line.
• Coplanar Points: Points that exist within the same flat surface or plane.
• Noncoplanar Points: Points that do not share the same plane.

Geometric Interactions

• Intersection: Common set of points shared by two figures.
• Segment: Portion of a line defined by two endpoint locations, includes all points in between.
• Ray: A part of a line that begins at a specific point and extends infinitely in one direction.

Special Line Relationships

• Perpendicular Lines: Lines that intersect at right angles (90 degrees).
• Parallel Lines: Lines that remain consistently distant from each other and do not meet; both lines exist within the same plane.
• Skew Lines: Lines that do not intersect and are not parallel, existing in different planes.

Line Segments and Their Properties

• Opposite Rays: Two rays sharing a common endpoint that extend in opposite directions to create a line.
• Congruent Segments: Line segments that are equal in length.
• Midpoint: The point that bisects a segment into two equal (congruent) segments.

Segment Divisions

• Endpoint: The terminating point of a line segment or ray.
• Segment Bisector: A line that intersects a segment at its midpoint, creating two congruent segments.
• Perpendicular Bisector: A line that is perpendicular to a segment and passes through its midpoint.

Line Relationships

• Intersecting Lines: Lines that cross one another at a designated point.