[" In "/_ABC," if "r_(1)=2r_(2)=3r_(3)" and "D" is the midpoint of "BC" ,then "],[cos/_ADC=]

In Delta ABC if r_(1)=2r_(2)=3r_(3) and D is the mid point of BC then cos/_ADC=

In DeltaABC if r_(1)=2r_(1)=3r_(3) and D is the mid point of BC then cos angle ADC=

In Delta ABC if r_1=2r_2=3r_3 and D is the mid point of BC then cos/_ADC=

In Delta ABC if r_1=2r_2=3r_3 and D is the mid point of BC then Cos/_ADC is (a) 7/25 (b) -7/25 (c) 24/25 (d) -24/25

In a !ABC , if r_(1) =2r_(2) =3r_(3) , then a:b:c =

In a Delta^("le") ABC if r_(1)=2r_(2)=3r_(3) then

In triangle ABC, of r_(1)= 2r_(2)=3r_(3) Then a:b is equal :-