Question

show that r1/bc+r2/ca+r3/ab=1/r-1/2R​

Answer 1

R is the circumradius of the triangle r1,r2,r3, ate the radius of the escribed circles of the above mentioned triangle respectively r is the inradius of the triangle a,b,c are the sides of the above mentioned triangle.

1) let under usual notations,triangle represents area of the triangleABC.

2)by properties of the triangle,r1=triangle/(s-a),r2=triangle/s-b and r3=triangle/(s-c). where s = (a+b+c)/2

remaining answer next day

Answer 2

Step-by-step explanation:

sorry I don't know when time permits I deffintly answer to this question