`(r_3+r_1)(r_3+r_2)sinC=2r_3sqrt(r_2r_3+r_3r_1+r_1r_2)`

( r_1 (r_2+ r_3))/( sqrt( r_1r_2+r_2r_3+ r_1r_3)) =

r_1^(2) = r_1r_2+ r_2r_3 +r_3r_1 triangle is

(r_2+r_3) sqrt((r r_1)/( r_2r_3)) = a

r + r_3 + r_1 - r_2 =

For any three non-zero vectors r_1,r_2 and r_3 .|(r_1.r_1,r_1.r_2,r_1.r_3),(r_2.r_1,r_2.r_2,r_2.r_3),(r_3.r_1,r_3.r_2,r_3.r_3)|=0. Then which of the following is false

In DeltaABC,(r_2(r_3+r_1))/sqrt(r_1 r_2+r_2 r_3+r_3r_1)=