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Basic Geometry Definitions
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Gravity
Key Concepts:
Terms in this set (44)
Chord
Any line segment with endpoints on a circle
Parallel Planes
Planes that do not intersect.
Line Segment
A subset of a line that contains two points of the line and all points between them.
Protractor
A measuring device used to measure an angle.
Obtuse Angle
An angle that measures greater than 90° and less than 180°.
Coplanar Lines
Lines that are in the same plane.
Angle
The union of two rays that share an endpoint.
Diameter
A chord that contains the center of a circle.
Open Segment
A segment without its endpoints.
Intersecting Planes
Planes that have a single line in common.
Minute
A unit of angle measure equal to 1/60 of a degree.
Reflex Angle
An angle that measures more than 180° but less than 360°.
Circle
The set of all points in a plane that are the same distance from a given point.
Axiom
A statement that cannot be proven.
Parallel Lines
Two distinct coplanar lines that have no point in common.
Line
A straight path connecting two distinct points and extending infinitely beyond those two points.
Arc
Any part of a circle that can be drawn without lifting a pencil.
Interior of an Angle
The region in the plane between two sides of a non-straight angle.
Skew Lines
noncoplanar lines, neither parallel nor intersecting
Adjacent Angles
Angles that share a common vertex and a common side, but their interiors do not overlap.
Minor Arc
An arc determined by a central angle whose measure is less than 180°.
Half-Open Segment
A segment without one endpoint.
Perpendicular Lines
Two intersecting lines that form right angles.
Supplementary Angles
Two angles whose measures add up to 180°.
Ray
A subset of a line starting at a point and extending infinitely in one direction.
Semi Circle
An arc determined by a diameter.
Degree
A unit of angle measure equal to 1/360 of a complete revolution.
Straight Line
An angle that measures 180°.
Major Arc
The longer of the two arcs determined by two points on a circle.
Collinear Points
Points that lie on the same line.
Second
A unit of angle measure equal to 1/3600 of a degree.
Vertex
The shared endpoint of two rays that make up an angle.
Acute Angle
An angle that measures less than 90°.
Dihedral Angles
The angle between two planes.
Complementary Angles
Two angles whose measures add up to 90°.
Plane
A flat surface uniquely determined by three noncollinear points.
Concurrent Lines
Lines (usually more than two) that intersect in the same point.
Central Angles
An angle in a circle with its vertex at the circle's center.
Right Angle
An angle that measures 90°.
Opposite Rays
Two rays with a common endpoint that point in opposite directions and form a straight line.
Intersecting Lines
Coplanar lines with exactly one point in common.
Theorem
Statements that can be proven.
Radius
A line segment between a circle's center and any point on the circle.
Closed Segment
A line segment that includes its endpoints.
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