8M: Geo QC (triangle sum & exterior angles)
1. Given the following diagram of ∆CDB.      Find the value of x.
x = 
A
xo
o
B
52o
C
D
2. Given the following diagram of ∆CDB.      Find the value of x.
x = 
C
xo
o
60o
D
B
112o
A
3. Given the following diagram of ∆CDB.      Find the value of x.
x = 
A
139o
o
B
xo
C
D
4. Given the following diagram of ∆CDB.      Find the measure of     angle DCB.
A
m∡DCB = 
110o
C
58o
D
o
B
52
5.  Two angles in a triangle measure     42 degrees and 57 degrees.  What is the
     measure of the third angle?
degrees
6.  One acute angle in a right triangle measures     72.5 degrees.  What is the measure of the      other acute angle?
degrees
7. What is the missing angle measure in the
    triangle below?
110
34
46 degrees
180 degrees
36 degrees
216 degrees
8.  Find m∡T.
m∡T = 
F
31
degrees
?
T
I
9.  Two angles in a triangle measure     108 degrees and 16 degrees.  What is the
     measure of the third angle?
degrees
10. Given the following
      diagram of ∆CDB.        Find the value of x.
x = 
o
C
74
60o
D
B
xo
A
11.  True or False        A triangle can have two 90 degree angles.
TRUE
FALSE
A
12. What is the value of x below?
20x
(71x-1)
70 
20
180 
13.  Find the value of a in the figure below.
14.  What is the value of x in the figure below?
15.  What is the measure of angle A?
degrees
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