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

Show that r(r_(1)+r_(2)+r_(3))=ab+bc+ca-s^(2).

Show that rr_(1)r_(2)r_(3)=Delta^(2)

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

Prove that r+r_(1)+r_(2)-r_(3)=4RcosC

In DeltaABC, " show that " (ab-r_(1)r_(2))/(r_(3))=(bc-r_(2)r_(3))/(r_(1))=(ca-r_(3)r_(1))/(r_(2))

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

Prove that 4(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=(a+b+c)^(2)

Show that (r r_1)/( r_2r_3) = tan ^(2) ""( A)/(2)

Show that r r_1 r_2 r_3 = Delta^2