" 23.In "/_ABC" show that "r+r_(3)+r_(1)-r_(2)=4R cos B" ."

Show that r+r_(3)+r_(1)-r_(2)=4RcosB.

" (i) Show that "r+r_(1)+r_(2)-r_(3)=4R cos C

Show that r_(1)+r_(2)+r_(3)-r=4R

Prove that r+ r_3 + r_1 -r_2= 4 R cos B

show that r_(2)r_(3) +r_(3) r_(1)+ r _(1) r_(2)=s^(2)

In Delta ABC , show that: (r_(1)+r_(2)) sec^(2) ""(C)/(2) = (r_(2) +r_(3)) sec^(2) ""(A)/(2) =(r_(3)+r_(1)) sec^(2)""(B)/(2)

In a Delta ABC if r+r_(1)+r_(2)-r_(3)=lambda^(2)R cos C then lambda is

In a !ABC if r_(1):r_(2):r_(3)=2:4:6, then a:b:c =