If in any `DeltaABC, a:b:c=4:5:6`, prove that the greatest angle is doule the smalles angle`

If in any Delta ABC,a:b:c=4:5:6, prove that the greatest angle is doule the smalles angle

In DeltaABC , a=4, b=5 and c=6, prove that the greatest angle is twice the least angle.

If in DeltaABC, a =3, b = 5, c = 7 find the greatest angle.

If in Delta ABC,a=3,b=5,c=7 find the greatest angle.

In /_\ABC , a=2 , b=3 , c=4 , prove that the triangle is obtuse angled.

In a DeltaABC, " if "a:b:c=4:5:6 , then the ratio of the radius of the circumcircle to the radius of the incircle is

In Delta ABC, if a,b,c are in A.P the greatest angle is A and least is C then 4(1-cos A)(1- cos C) =

In Delta ABC, if cot""A/2: cot""B/2:cot ""C/2=1:4:15 , then the greatest angle of the triangle is

In any DeltaABC , prove that (sinA)/(sin(A+B))=a/c