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Chapter 3
Vocabulary
10
Mathematics
9th Grade
02/20/2006

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Term
Parallel lines
Definition
Two lines that are coplanar and do not intersect.
Term
Skew lines
Definition
two lines that do not intersect and are not coplanar
Term
Parallel planes
Definition
two planes that do not intersect
Term
transversal
Definition
a line that intersects two or more coplanar lines at different points
Term
corresponding angles
Definition
2 angles that are formed by two lines and a transversal and occupy corresponding positions
Term
flow proof
Definition
a proof using arrows to show that flow of the logical argument
Term
theorems
Definition
if two lines intersect to form a linear pair of congruent angles, then the lines are perpendicular
Term
Alternate exterior angles
Definition
if 2 parallel lines are cut by a transversal then the pairs of alternate exterior angles are congruent
Term
Perpendicular transversal
Definition
if a transversal is perpendicular to one of two parallel lines, then it is congruent to the other
Term
same side interior angles
Definition
also called consecutive angles interior angles
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