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Ch1 day7
September 24, 2015
Geometry Chapter 1
Chapter 1 Day 7
OBJ: to define ANGLES!
to name, classify, and measure angles. (
Defn: an angle is formed by two rays with a common
endpoint.
)
Ch1 day7
September 24, 2015
The angle below is made up of OC and OW.
Naming angles: 4 ways
O
1
C
no-no's
COW
WOC
How many
Name them
WXY
WXZ
ZXY
1
O
's do you see?
W
W
Z
X
Y
Ch1 day7
September 24, 2015
What if
m WXZ = 70o and
W
Z
m ZXY is 40o
X
What do you think m WXY would be?
Y
Ch1 day7
September 24, 2015
There are 4 types of angles we will be talking about:
Straight, obtuse, right, and acute.
Straight angle: angle whose measure is 180o
Obtuse angle: an angle whose measure is between 90o and 180o
Right angle: an angle whose measure is 90o
Acute angle: an angle whose measure is between 0o and 90o
Ch1 day7
September 24, 2015
There are 4 types of angles we will be talking about:
Straight, obtuse, right, and acute.
Straight angle: angle whose measure is 180o
Obtuse angle: an angle whose measure is between
90o and 180o
Right angle: an angle whose measure is 90o
Acute angle: an angle whose measure is between 0o and 90o
180o
180o
90o
Right angle
Acute angle
5o
Straight angle
Obtuse angle
17o
179o
30 o
89o
109o
100o
45
90o
67o
1
o
30o
141o
60o
91o
40o
o
31o
109
36o
o
132o
138o
179o
179o
67o
Ch1 day7
September 24, 2015
To measure angles:
28
50
64
123
Ch1 day7
September 24, 2015
130
Acute 89
90
o
Obtuse 132
o
Ch1 day7
September 24, 2015
OBJ: To use the Angle Addition Postulate
GIVEN: pt B is in the interior of CAT then
m CAB + m BAT = m CAT
C
B
A
T
GIVEN: pt C is in the interior of AJL
Draw figure and write the angle addition postulate.
m
+m
=m
Ch1 day7
September 24, 2015
B
C
T
m
A
+m
W
=m
Y
X
m
+m
Z
=m
Ch1 day7
September 24, 2015
Given:
m CAB = 62o
m BAT = 53o
C
B
Find:
m CAT
A
Label fig and write formula first!
m
+m
=m
T
Ch1 day7
September 24, 2015
GIVEN: m JAS = 140o, find m SAY
Given: JY
S
J
A
Y
HW pp 29-33 (16-28all, 48, 67-70)
Figs for
no fig for 24-26, measure and classify 20-23, 27, 28, 48, 70
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