Part 1 Flashcards
Parallel Lines
Two lines that do not intersect and are coplanar (on the same plane).
Alternate Interior Angles
If a transversal cuts across non-parallel lines, each Alternate Interior Angle is simply the alternate angle to the other.
Straight Angle
An angle measuring 180 degrees.
Right Angle
An angle measuring 90 degrees.
Vertical Angles
Angles that are opposite one another (and congruent) when two lines intersect.
Adjacent Angles
Two angles on a plane that share a common vertex and side but have no overlap.
Supplementary Angles
Two angles that have a sum of 180 degrees.
Complementary Angles
Two angles that have a sum of 90 degrees.
Ray
Part of a line consisting of an endpoint and all points on the line extend away from the endpoint.
Opposite Rays
Two rays that share a common end point and form a 180 degree angle.
Line Segment
Part of a line that consists of two endpoints and a line in-between.
Perpendicular Lines
Two lines that intersect at a 90 degree angle.
Perpendicular Bisector
A line that intersects a segment at its midpoint creating 90 degree angles and two equal halves of the segment.
Segment Bisector
A line, ray or segment which cuts another line segment into 2 equal halves.
Angle Bisector
A line or ray that cuts an angle in half, forming two congruent angles.