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70a Math
Question 11
2011 December(70A) Math Question 11
-
Choice B
∠
B
D
C
=
90
°
−
∠
C
B
D
∠
C
B
D
=
180
°
−
25
°
−
30
°
=
55
°
⇒
∠
B
D
C
=
90
°
−
55
°
=
35
°
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