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Chapter 3: Lines and Angles
Geometry terms about lines and angle relationships
9
Mathematics
9th Grade
10/19/2011

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Term
Parallel Lines
Definition
Two coplanar lines that never intersect.
Term
Skew Lines
Definition
Lines that do not intersect and are not coplanar.
Term
Transversal
Definition
A line that intersects two or more coplanar lines at different points.
Term
Corresponding Angles
Definition
Two angles that are formed by two lines and a transversal and occupy the same relative position.
Term
Alternate Interior Angles
Definition
Two angles formed by two lines and a transversal that lie on opposite sides of the transversal and inside the two lines.
Term
Alternate Exterior Angles
Definition
Two angles formed by two lines and a transversal that lie on opposite sides of the transversal and are outside the two lines.
Term
Consecutive Interior Angles
Definition
Two angles that are formed by two lines and a transversal that are on the same side of the transversal and both inside the two lines.
Term
Same Side Interior Angles
Definition
Another name for Consecutive Interior Angles
Term
Flow Proof
Definition
A proof written using boxes and arrows to show the logical flow of the argument.
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