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Geometry-Characteris

SSC Math 8 Geometry-Characteristics

TermDefinition
Triangle Sum Theorem The theorem that states that the measures of the angles in a triangle add up to 180 degrees
Parallel lines Lines in a plane that do not intersect
Transversal a line that intersects two or more lines
Corresponding Angles For two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and on the same sides of the other two lines.
Alternate Interior Angles For two lines intersected by a transversal, a pair of nonadjacent angles that lie on opposite sides of the transversal and between the other two lines
Alternate Exterior Angles For two lines intersected by a transversal, a pair of angles that lie on opposite sides of the transversal and outside the other two lines
Vertical Angles A pair of opposite congruent angles formed by intersecting lines
Supplementary Angles Two angles whose measures have a sum of 180 degrees
Complementary Angles Two angles whose measures have a sum of 90 degrees
Acute Angle An angle that measures greater than 0 degrees and less than 90 degrees
Obtuse Angle An angle whose measure is greater than 90 degrees but less than 180 degrees
Right Angle An angle that measures 90 degrees
Straight Angle An angle that measures 180 degrees
Adjacent Angles Angles in the same plane that have a common vertex and a common side
Angle A figure formed by two rays with a common endpoint called the vertex
Congruent Angles Angles that have the same measure
Perpendicular Lines Lines that intersect to form right angles
Created by: heather.lander