Reteaching
Name
16-2
Line Segments, Rays,
and Angles
Here are some important geometric terms.
X
Y
A
Line segment
A line segment is
part of a line.
It has two
endpoints. This is
line segment XY.
B
Ray
A ray is part of a line. It
has one endpoint and
goes on and on in one
direction. This is ray AB.
Acute angle
An acute
angle is less
than a right
angle.
Obtuse angle
An obtuse
angle is greater
than a right
angle.
Right angle
A right angle is
a square corner,
or 90 degrees.
Straight angle
A straight angle
is 180 degrees.
Use geometric terms to describe what is shown. Be as specific as possible.
1.
2.
Obtuse
angle
4. Name three different rays.
FG , EL 
 
 , ED 
 
3.
Straight
angle
Sample
answers
for 4–5
5. Name two different line segments.
FB
 , AF
 
Line
segment
C
A
F
B
E
D
R 16•2
L
G
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