`r^3 =729` then `r=?`

If |A|=|(a,4),(4,a)| and |A^(3)|=729 , then the value of a is :

If (3)^(n)=729 , then n is equal to ……………..

If R+r=r_(3) then C=

If r_(1)^(2)=r_1r_(2)+r_(2)r_(3)+r_(3)r_(1) then the triangle is

If r_1 , r_2 , r_3 are the radii of the escribed circles of a Delta ABC and if r is the in radius then r_1r_2r_3-r( r_1r_2+r_2r_3+r_3r_1)

If r_(1),r_(3),r_(1) are the radii of the escribed circles of a DeltaABC and if r is the radius of its incircle then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=

In triangle ABC, if r_(1)+r_(2)=3R and r_(2)+r_(3)=2R , then