If `Delta ABC` is right angled at A then `r_2 +r_3=`

In Delta ABC , right angled at A, cos^(-1)((R )/(r_(2)+r_(3))) is

In Delta ABC , right angled at A, cos^(-1)((R )/(r_(2)+r_(3))) is

In Delta ABC , right angled at A, cos^(-1)((R )/(r_(2)+r_(3))) is

In Delta ABC, right angled at A,cos^(-1)((R)/(r_(2)+r_(3))) is

In Delta ABC , if r_1 lt r_2 lt r_3 then

In Delta ABC , if 2R= r_1-r then angle A=

A statements of Assertion (A) is followed by a statement of Reason (R ). Mark the correct choice as. Assertion (A): ABC is an isoseles triangle right triangle , right angled at C. Then AB^(2) = 3AC^(2) . Reason (R ): In an isosceles triangle ABC if AC = BC and AB^(2) = 2AC^(2) then angle C = 90^(@) .