1.

Let ABC be triangle having o and I as its circumcenter and incentre, respectively. If R and r are the circumradius and the inradius, respectively, then (OI)^(2) = ...... Further and also the triangle AIO is a right angle triangle if and only if a, b, c are in ......

Answer»

`R^(2) - 2Rr, A.P`
`R^(2) - 2Rr, G.P.`
`R^(2) + 2Rr, A.P.`
`R^(2) + 2Rr + G.P.`

ANSWER :a


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