1.

Let H be the ortho centre of Delta^("le") ABC,then angle subtended by the side BC at the centre of in circle of Delta^("le') BHCis

Answer»

`A/2 + pi/2`
`(B+C)/2 + pi/2`
`(B - C)/2 + pi/2`
`(B + C)/2 + pi/4`

ANSWER :b


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