Question

in triangle ABC,1/r1+1/r2+1/r3

Answer 1

✨✨Answer is here✨✨

➡️✨✨see this pic .....✨✨

✔️✔️

Answer 2

Answer:1/r

Step-by-step explanation

1/R1+1/R2+1/r3

=1/∆/s-a+1/∆/s-b+1/∆/s-c

=s-a/∆+s-b/∆+s-c/∆

=s-a+s-b+s-c/∆

=3s-(a+b+c)/∆

=3s-2s/∆

=s/∆

This is the answer