Mathematics
Senior High
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131
C
F
49°
20
29°
E
B
180-129-19
D
na
a
A
39
78
4
(1)
a= 25°
2
ẞ= 65°
(2)
a= 115°
B= 100°
6
(3)
α=
60°
(4)
α=
51°
4)
Answers
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