If in a triangle `(1-(r_1)/(r_2))(1-(r_1)/(r_3))=2` then the triangle is right angled (b) isosceles equilateral (d) none of these

If in a triangle (r)/(r_(1)) = (r_(2))/(r_(3)) , then

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

If r_1=r_2+r_3+r prove that the triangle is right angled .

If r_1=r_2+r_3+r prove that the triangle is right angled .

If in a triangle r_1=r_2+r_3+r , prove that the triangle is right angled.

If all the vertices of a triangle have integral coordinates, then the triangle may be (a) right-angle (b) equilateral (c) isosceles (d) none of these

If r_(1) +r_(2)+ r = r_(3), then show that Delta is right angled.

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

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

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