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9 terms

Riley Math B Geometry

line segment
part of a line with two endpoints
a line segment that has no end points
a part of a line with one endpoint and one side goes on forever.
parallel lines
lines in the same plane that never intersect
perpendicular lines
two lines intersecting at or forming right angles
vertical angles
a pair of opposite congruent angles formed by intersecting lines
adjacent angles
are a pair of angles with a common vertex and a common side, but no common interior points
complementary angles
two angles whose sum is 90 degrees
supplementary angles
two angles whose sum is 180 degrees