`(r_1-r)(r_2-r)(r_3-r)=4R r^2`

(r_(1)-r)(r_(2)-r)(r_(3)-r)=4Rr^(2)

In a triangle A B C ,\ (r_1-r)(r_2-r)(r_3-r) is equal to 4R r^2 (b) (4a b cdot)/((a+b+c)^2) 16 R^3(cos A+cos B+cos C-1) r^3cose c A/2cose c B/2cose c C/2

In Delta ABC, (r_1+r_2)(r_2+r_3)(r_3+r_1)=

If (r_2-r_1) (r_3-r_1) =2r_2r_3. show that A = 90 ^(@) (1-(r_1)/( r_2)) (1-(r_1)/(r_3)) =2 , show that A = 90 ^(@)

In DeltaABC, the value of ((r_1+r_2)(r_2+r_3)(r_3+r_1))/(R(s)^(2) is