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Byju's Answer
Standard IX
Mathematics
Isosceles Triangle
In a triangle...
Question
In a triangle ABC ,cos A + cos B + cos C =3/2 Prove that triangle ABC is an equilateral triangle
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Similar questions
Q.
In a triangle
Δ
A
B
C
prove that
a
(
b
cos
C
−
c
cos
B
)
=
b
2
−
c
2
.
Q.
If in
△
A
B
C
,
cos
A
+
cos
B
+
cos
C
=
3
/
2
, then triangle ABC is
Q.
In any triangle ABC prove that identities.
In a triangle prove that
cos
A
+
cos
B
+
cos
C
>
1
but not greater than
3
/
2
.
Q.
In
△
A
B
C
, prove that,
a
(
b
cos
C
−
c
cos
B
)
=
b
2
−
c
2
Q.
In a
△
A
B
C
,
cos
2
A
+
cos
2
B
+
cos
2
C
=
1
prove that the triangle is right angled
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