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Byju's Answer
Standard XII
Mathematics
Average Rate of Change
If in a trian...
Question
If in a triangle
Δ
A
B
C
,
a
2
−
b
2
−
c
2
=
0
, then
A
π
4
<
A
<
π
2
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B
π
2
<
A
<
π
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C
A
=
π
2
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D
A
<
π
4
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Solution
The correct option is
B
A
=
π
2
Given,
in a triangle
Δ
A
B
C
,
a
2
−
b
2
−
c
2
=
0
.....(1).
We have,
cos
A
=
b
2
+
c
2
−
a
2
2
b
c
or,
cos
A
=
0
[ Using (1)]
or,
A
=
π
2
.
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