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66f Math
Question 15
2009 April(66F) Math Question 15
Perimeter, Area, Volume
- Triangles, Squares, Rectangles, Circles
Choice E
∠
B
=
90
°
∠
A
+
∠
B
+
∠
C
=
180
°
⇒
∠
A
+
∠
C
=
90
°
∵
∠
A
>
43
°
90
−
43
=
47
∴
∠
C
<
47
°
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