a series of points that extend in opposite directions without end.
a part of a line with one endpoint and all points of the line on one side of the endpoint.
a part of a line with two endpoints and all points in between.
a flat surface that extends indefinitely in all directions and has no thickness.
lie in the same plane and have exactly one point in common.
lines in the same plane that never intersect.
lie in different planes and are neither parallel nor intersecting.
is a figure formed by two rays with a common endpoint.
the point of intersection of two sides of an angle or figure.
a location in space that has no size
an angle less than 90 degrees but more than 0 degrees
an angle between 90 and 180 degrees
an angle that measures 90 degrees
an angle of 180 degrees
Two angles whose sum is 90 degrees
Two angles whose sum is 180 degrees
are a pair of angles with a common vertex and a common side, but no common interior points
opposite angles formed by two intersecting lines
angles that have equal measures
sides that have the same length.