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

The exradii `r_1,r_2` and `r_3` of ` /_\A B C` are in H.P.show that its sides are in A.P .

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`r_1=D/(s-a),r_2=D/(s-b),r_3=D/(s-c)`
`D/(s-a),D/(s-b),D/(s-c)` are in HP
s-a,s-b,s-c are in Ap
a,b,c are in AP.
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