Transcript Chapter 1-4 (Measure and Classify Angles)

 What
vertex
is an angle?
sides
 Two
different rays
with the same
endpoint.
 Rays are the sides,
endpoint is the
vertex.
 Named with 3
points or by the
vertex.
 Name
the angles
you see in the
diagram
 Example
C
D
A
E
 Measuring
angles
with a protractor
 Write
 Different
 Acute
angles:
types of
either <ABC
is 32º or
m<ABC=32º
(less than
90º)
 Obtuse (more than
90º
 Right angle
(exactly 90º)
 Straight (180º)
 Example
 Postulate
Addition
 Page
25 in
textbook
4: Angle
 If
P is in the
interior of <RST,
then the measure
of <RST is equal to
the sum of the
measures of <RSP
and <PST
 Example
 Given
the
m<GFJ=155º, find
m<GFH and m<HFJ
 Example
 Given
that <VRS is
a right angle, find
m<VRT and m<TRS
 Congruent
angles
2
angles are
congruent if they
have the same
measure (curved
line)
A
 <A
B
<B
 Example
 Identify
all pairs of
congruent angles
 If
m<P=120º, what
is m<N?
 Angle
Bisector
A
ray that divides
an angle into 2
angles that are
congruent.
 WY
bisects <XWZ
Examples