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The exradii r1,r2 and r3 of A B C are i...

The exradii `r_1,r_2` and `r_3` of ` A B C` are in H.P. Show that its sides `a , ba n dc` are in `AdotPdot`

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`r_(1), r_(2),r_(3)` are in H.P
`rArr 1//r_(1), 1//r_(2), 1//r_(3)` are in A.P
`rArr (s -a)/(Delta), (s -a)/(Delta), (s-c)/(Delta)` are in A.P
`rArr s -a, s - b, s -c` are in A.P
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