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Accl. Geometry - Vocabulary
Section 1-1 to 1-5
30
Mathematics
Not Applicable
09/08/2005

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Term
Point
Definition
A dot on a line or graph.
Term
Line
Definition
Infinite number of points.
Term
Plane
Definition
A flat surface with no egdes.
Term
Space
Definition
Set of all points.
Term
Collinear
Definition
Points on the same line.
Term
Coplanar
Definition
Points or lines on the same plane.
Term
Postulate
Definition
Accepted statement of fact.
(Axiom or Property)
Term
Postulate 1-1
Definition
Through any two points, there is exactly one line.
Term
Postulate 1-2
Definition
If 2 lines lines intersect, then they intersect at exactly one point.
Term
Postulate 1-3
Definition
If two planes intersect, then they intersect at exactly one line.
Term
Postulate 1-4
Definition
Through any 3 non-collinear points there is exactly one plane.
Term
Segment
Definition
A part of a line with two end points and an infinite number of points.
Term
Ray
Definition
A line with one end point.
Term
Opposite Rays
Definition
Two collinear rays with a common endpoint.
Term
Parallel Lines
Definition
Coplanar lines that never interest.
Term
Skew Lines
Definition
Non-coplanar lines that never interest.
Term
Congruent Segments
Definition
Two segments with the same length.
Term
Segment Addition Postulate
Definition
If A, B, and C are collinear with B inbetween A and B, then AB + BC = AC.
Term
Midpoint
Definition
A point which divides a sgement into two congruent segments.
Term
Angle
Definition
Formed by two rays with a common endpoint.
Term
Acute
Definition
A Kind of Angle
0° - 90°
Term
Right
Definition
A Kind of Angle
90°
Term
Obtuse
Definition
A Kind of Angle
90° - 180°
Term
Straight
Definition
A Kind of Angle
180°
Term
Angle Addition Postulate
Definition
[image]

mL1 + mL2 = mLDOG.
Term
Congruent Angles
Definition
Two angles with the same measure.
Term
Perpendicular
Definition
Two lines that intersect to form right angles.
Term
Perpendicular Bisector
Definition
Of a segment is a line, ray, or segment that divides the segment into two congruent parts; goes through midpoint; perpendicular to the segment.
Term
Angle Bisector
Definition
A ray that divides an angle into two congruent angles.
Term
Inductive Reasoning
Definition
Conclusion based on patterns and observations.
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