Download Lines, Points, Rays, Angles, and Segments

Points
• A point has no length or width, it just specifies
an exact location.
• We name this point with a number or letter.
N
A
H
For example: this is
“Point H”
Naming Lines
True Lines never end, so we name them
with any two given points on that line.
B
C
We call this
line BC or CB.
Put double arrows above it.
Naming Line Segments
A line segment does not extend forever,
but has two distinct endpoints.
P
Q
We can call this PQ or QP
K
Put a bar over the name: KL
Endpoint,
not arrow.
L
Naming Rays
Rays have one endpoint. We name it using that
endpoint and any other given point on that ray.
T
S
ST
Put a line with one
arrow head above it.
Naming Angles
Use the vertex and a point from each ray to
name the angle. The vertex must be the
middle letter. Also: just use the vertex.
A
B
C
ABC
CBA
B
Sometimes we put this symbol
in front of an angle:
Classifying Angles
• Acute Angles are smaller than 90 degrees.
• Obtuse Angles are larger than 90 degrees.
• Right Angles are exactly 90 degrees.
Geometry Book: pages 4-6
• On a separate piece of paper: pg 4-6: 4-20 all
• You may work in pairs, one paper per group.
• Note: “collinear” means to make a line
Not collinear
Collinear
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