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GEOMETRY VOCABULARY – UNIT 1
Term
Section 1
POINT
LINE
COLLINEAR
PLANE
COPLANAR
LINE
SEGMENT
RAY
ENDPOINT
POSTULATE
Description
A point names a location in 2 or 3
dimensions. It has NO size.
A line is a straight path
that has no thickness and
infinitely extends in both directions.
Collinear points lie on the same line .
A plane is a flat surface
that has no thickness and
infinitely extends in all directions.
Points or lines that lie on the same
plane are called coplanar.
A line segment is a straight path that
begins at one point and ends at
another point. It has a finite length
A straight path that has a beginning
but no end is called a ray.
A point that begins or ends
a line segment or begins a ray
is called an endpoint
A statement we are asked to accept as
true is called a postulate (or axiom).
Diagram
How to Name It
Use the word point
and a capital letter.
Point P
Use a script cap:
Plane V,
or
three coplanar points
Plane FGH
MORE GEOMETRY VOCABULARY – UNIT 1
Term
OPPOSITE RAYS
Section 2
CONSTRUCTION
BETWEEN
COORDINATES
DISTANCE/LENGTH
CONGRUENT
SEGMENTS
BISECT
MIDPOINT
SEGMENT
BISECTOR
PAGE 2
Description
Opposite rays share a common
endpoint and form a straight
line.
Construction is the process we
use to create precise figures
and diagrams
A point lies between two
other points if all 3 points are
collinear.
The markings on a ruler used to
measure line segments are
the coordinates of the ruler.
Distance or length is the
absolute value of the
difference between two
coordinates.
Line segments that are the
same length are congruent
segments.
To bisect a segment is to divide
it into two congruent pieces.
A midpoint is a point that
bisects a line segment.
A segment bisector is any point,
line, line segment, ray, or plane
that bisects a line segment.
Diagram
How to Name It
We need another
point to name any
ray.
MORE GEOMETRY VOCABULARY – UNIT 1
Term
Section 3
ANGLE
VERTEX
INTERIOR/EXTERIOR
OF AN ANGLE
DEGREE
MEASURE
ACUTE ANGLE
RIGHT ANGLE
OBTUSE ANGLE
STRAIGHT ANGLE
Page 3
Description
An angle is a figure formed by two
rays with a common endpoint
The vertex of an angle is found at
the common endpoint of the two
rays forming the angle.
The interior of an angle is between
the rays forming the angle. The
exterior of an angle is outside the
rays forming the angle.
The measurement of 1/360 th of the
one rotation it takes to form a
circle is called a degree.
Angle measure reveals how close an
angle is to the 360O rotation of a
complete circle . Therefore, angles
are measured in degrees
An acute angle has a measure
between 0 and 90.
A right angle has a measure of
exactly 90 .
An obtuse angle has a measure
between 90 and 180.
A straight angle has a measure of
exactly 180 .
Hang In There, Still More …
Diagram
How to Name It
There are 4 ways to name the angle below:
 its unique vertex: Y
 by number: 2
 the vertex and point on each side: XYZ or ZYX
MORE GEOMETRY VOCABULARY – UNIT 1
Term
CONGRUENT ANGLES
ANGLE BISECTOR
Section 4
ADJACENT ANGLES
LINEAR PAIR
COMPLEMENTARY
ANGLES
SUPPLEMENTARY
ANGLES
VERTICAL ANGLES
Page 4
Description
Congruent angles have the same
measurement.
A ray, line or line segment that
divides an angle into two
congruent angles is called an
angle bisector.
Adjacent angles share a
common side. They lay next to
each other without any gaps.
Linear pairs are adjacent angles
that form a straight angle of
180 .
The measures of two
Diagram
How to Name It
complementary angles
Which pair are
supplementary?
supplementary angles
Complementary?
sum to 90 .
The measures of two
sum to 180 .
When two lines intersect , the
two angles opposite each other
are called vertical angles.
1.5
COORDINATE PLANE
COORDINATE