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Parallel Lines & Angle Relationships
Vocabulary covering parallel and perpendicular lines as well as angles made by transversals
11
Mathematics
8th Grade
04/04/2010

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Term
parallel lines
Definition
lines that never intersect
Term
perpendicular lines
Definition
two lines that form a 90º angle when they intersect
Term
transversal
Definition
a line that intersects parallel lines
Term
congruent angles
Definition
angles that have the same measure
Term
supplementary angles
Definition
angles that add up to 180º
Term
complementary angles
Definition
angles that add up to 90º
Term
vertical angles
Definition
congruent angles that are opposite each other when two lines intersect
Term
corresponding angles
Definition
congruent angles that are in the same place on different/similar shapes
Term
alternate interior angles
Definition
congruent angles in between two parallel lines on opposite sides of a transversal next to different intersecting lines
Term
alternate exterior angles
Definition
congruent angles on the outside of two parallel lines on opposite sides of a transversal next to different intersecting lines
Term
intersecting lines
Definition
lines that touch
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