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Byju's Answer
Standard XII
Mathematics
Property 2
Refer to the ...
Question
Refer to the triangle given in
figure
.
If
c
o
s
e
c
A
is
5
m
, then
m
is:
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Solution
Given,
△
A
B
C
, A perpendicular from B on AC, let it cut AC at D, such that
∠
B
D
A
=
∠
B
D
C
=
90
∘
A
D
=
3
B
D
=
4
B
C
=
12
In
△
A
B
D
,
A
B
2
=
B
D
2
+
A
D
2
A
B
2
=
3
2
+
4
2
A
B
=
5
In
△
B
C
D
B
C
2
=
C
D
2
+
B
D
2
12
2
=
C
D
2
+
4
2
C
D
2
=
128
C
D
=
8
√
2
Now,
c
o
s
e
c
A
=
H
P
=
A
B
B
D
=
5
4
=
1
1
4
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