ln a Delta ABC," if "r=1,R=4,Delta=8," then the value of "ab+bc+ca" is equal to "

In Delta ABC,r=1,R=4,Delta=8 then the value of ab+bc+ca=

In Delta ABC, if r-1,R=4, Delta =8 , then ab+bc+ca=

If abc=8;a,b,c in R^(+) then the minimum value of a^(2)+b^(2)+c^(2)+ab+bc+ca is equal to

AL, BM and CN are perpendicular from angular points of a triangle ABC on the opposite sides BC, CA and AB respectively. Delta is the area of triangle ABC, (r ) and R are the inradius and circumradius. If area of Delta LMN is Delta ', then the value of (Delta')/(Delta) is

AL, BM and CN are perpendicular from angular points of a triangle ABC on the opposite sides BC, CA and AB respectively. Delta is the area of triangle ABC, (r ) and R are the inradius and circumradius. If area of Delta LMN is Delta ', then the value of (Delta')/(Delta) is

AL, BM and CN are perpendicular from angular points of a triangle ABC on the opposite sides BC, CA and AB respectively. Delta is the area of triangle ABC, (r ) and R are the inradius and circumradius. If perimeters of DeltaLMN and Delta ABC an lamda and mu, then the value of (lamda)/(mu) is

AL, BM and CN are perpendicular from angular points of a triangle ABC on the opposite sides BC, CA and AB respectively. Delta is the area of triangle ABC, (r ) and R are the inradius and circumradius. If perimeters of DeltaLMN and Delta ABC an lamda and mu, then the value of (lamda)/(mu) is

In Delta ABC, (ab-r_1 r_2)/r_3=