Points, Rays, Lines & Segments
B
Point B
YX
Line Segment XY
XY
Line Segment YX
DC
Line Segment CD
MN
Line NM
NM
Line MN
BA
Ray AB
AB
Ray BA
Naming & classifying angles
Angles
An angle is formed when two rays have a common vertex.
An angle is made up of at least three points.
We can name and angle using a number or three letters
Angles
Let’s watch this quick video on naming angles:
http://www.khanacademy.org/math/geometry-1/core-geometry/v/angle-basics
Acute Angles
Measures less than 90 degrees
2
1< 2
< 1
Right Angle
Measures 90 degrees
Q R
P
< PQR or < RQP
QP
R
< RPQ or < QPR
Right Angle
Measures greater than 90 degrees
B
< 3
3
C
< ABC or <CBA A
