prove that : triangle ABC, `1/r_1+1/r_2+1/r_3=1/r `

In a triangle ABC,if 1/r_1^2+1/r_2^2+1/r_3^2+1/r^2=

Prove that : 1/(r_1)+1/(r_2)+1/(r_3)=1/r

In an acute angled triangle ABC, r + r_(1) = r_(2) + r_(3) and angleB gt (pi)/(3) , then

In a triangleABC , if 1/r^(2) + 1/r_(1)^(2) + 1/r_(2)^(2) + 1/r_(3)^(2) = (a^(2) + b^(2) + c^(2))/(Delta^(n)) , then n is equal to ………..

In a triangle ABC , if 2R + r = r_(1) , then

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

In a triangle ABC, prove that r^2+r_1^2+r_2^2+r_3^2=16R^2-a^2-b^2-c^2.

In a triangle ABC if r_(1) = 8, r_(2) = 12 and r_(3) = 24, then a =

In a triangle ABC prove that a(rr_1+r_2r_3)=b(rr_2+r_3r_1)=c(rr_3+r_1r_2)=abc

If in a triangle ABC, r_(1)+r_(2)+r_(3)=9r , then the triangle is necessarily