1.

Lengths of the tangents from A, B, and C to the incircle are in A.P., then

Answer»

`r_(1),r_(2),r_(3)` are in H.P
`r_(1),r_(2),r_(3)` are in A.P
a,b,C are in A.P
`coaA=(4c-3b)/(2C)`

ANSWER :A::C::D


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