Download Test 1 Vocabulary Section 1.1 Picture/Notes Point: names a location

Test 1 Vocabulary
Section 1.1
Point: names a location and has
no size. It is represented by a
dot.
Line: a straight path that has no
thickness and extends forever.
Plane: a flat surface that has no
thickness and extends forever.
Collinear: points that lie on the
same line.
Coplanar: points that lie in the
same plane.
Picture/Notes
Segment: the part of a line
consisting of two points and all
points between them.
Endpoint: a point at one end of a
segment or the starting point of
a ray.
Ray: a part of a line that starts at
an endpoint and extends forever
in one direction.
Opposite Rays: two rays that
have a common endpoint and
form a line.
Section 1.2
Distance: the absolute value of the difference
of the coordinates of the points.
Picture/Notes
Length: the distance between the two
endpoints of a segment.
Congruent segments: two segments that have
the same length.
Midpoint: the point that divides a segment
into two congruent segments.
Bisect: to divide into two congruent parts.
Segment bisector: a line, ray, or segment that
divides a segment into two congruent
segments.
Section 1.3
Angle: a figure formed by two rays with a
common endpoint.
Vertex: the common endpoint of the sides of
the angle.
Acute angle: an angle that measures greater
than 0 degrees and less than 90 degrees.
Right angle: an angle that measures 90
degrees.
Obtuse angle: an angle that measures greater
than 90 degrees and less than 180 degrees.
Picture/Notes
Straight angle: a 180 degree angle.
Congruent angles: angles that have the same
measure.
Angle bisector: a ray that divides an angle into
two congruent angles.
Section 1.4
Adjacent angles: two angles in the same plane
with a common vertex and a common side,
but no common interior points.
Linear pair: a pair of adjacent angles whose
noncommon sides are opposite rays.
Picture/Notes
Complementary angles: two angles whose
measures have a sum of 90 degrees.
Supplementary angles: two angles whose
have a sum of 180 degrees.
Vertical angles: the nonadjacent angles
formed by two intersecting lines.