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

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

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

In a DeltaABC , if(c+a+b) (a+b-c) =ab, then the measure of angle C is

If the sides of DeltaABC in the ratio 4 : 5 : 6, prove that one angle is twice that of the other.

In any DeltaABC , prove that (sin B)/(sin(B+C) ) = b/a

If two angles of a DeltaABC are 45 ° and 60°, then the ratio of the smallest and greatest sides are

In a triangle ABC, 8R^2=a^2+b^2+c^2 prove that the triangle is right angled

In any DeltaABC , prove that asin(A/2+B)=(b+c)sin""A/2

In DeltaABC , The sines of the angles of a triangle are in the ratio of 4 : 5 : 6, prove that the cosines of the angles are 12 : 9 : 2.

The angles of a triangle are in A.P. If the greatest angle is double the least, then the ratio of the angles (in increasing order) is 2:3:4 (b) 1:2:3 (c) 3:4:5 (d) none of these