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Parallel/Transversal

Parallel Lines, Transversals, and Angles

TermDefinition
congruent Equal in measure
parallel lines lines in the same plane that never intersect
transversal a line that intersects two or more other lines
supplementary angles angles whose sum is 180 degrees
complementary angles angles whose sum is 90 degrees
corresponding angles angles created by parallel lines and transversals and are in the same position on the drawing (upper right, lower left, etc.); they are congruent
alternate interior angles angles created by parallel lines and transversals who are on opposite sides of the transversal inside the parallel lines; they are congruent
alternate exterior angles angles created by parallel lines and transversals who are on opposite sides of the transversal outside the parallel lines; they are congruent
vertical angles angles created by two intersecting lines and are directly across the vertex from each other; they are congruent
adjacent angles angles who share a vertex and one common side
adjacent supplementary angles angles who share a vertex, a common side, and are on a straight line; their sum is 180 degrees
The sum of the angles in a triangle 180 degrees
The number of degrees all around in a circle 360 degrees
perpendicular lines lines that intersect at right angles
 



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