1.

If I is incentre of the triangle ABC, P_(1),P_(2),P_(3) are radii of circum circles of Delta^("le") IBC, ICA, IAB respectively

Answer»

`2P_(1)=a secA//2`
`2P_(2)=B secB//2`
`2P_(3)=C secC//2`
`P_(1)P_(2)P_(3)=2R^(2)r`

ANSWER :abcd


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