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CDS Model Paper 5 Mathematics
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© examsnet.com
Question : 95
Total: 100
The external bisector of
∠
A
B
C
of
Δ
A
B
C
intersects the straight line through A and parallel to BC at the point D. If
∠
A
B
C
=
50
°
then measure of
∠
A
B
C
is
65
°
55
°
40
°
20
°
Validate
Solution:
∠
A
B
C
=
50
°
∠
D
A
B
=
∠
A
B
C
[
alternate angle ]
∠
D
A
B
=
50
°
In
∠
A
D
B
∠
A
+
∠
D
+
∠
B
=
180
°
50
°
+
∠
A
D
B
+
65
°
=
180
°
∠
A
D
B
=
180
°
−
115
°
∠
A
D
B
=
65
°
© examsnet.com
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