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Offline Centres

Let H be the ortho centre of $Δ^{le} ABC$ , then angle subtended by the side BC at the centre of in circle of $Δ^{1 e} BHC$ is

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$\frac{B + C}{2} + \frac{π}{4}$

$\frac{B - C}{2} + \frac{π}{2}$

$\frac{B + C}{2} + \frac{π}{2}$

$\frac{A}{2} + \frac{π}{2}$

answer is B.

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H-Orthocentre

$α + 45^{\circ} - \frac{C}{2} + 45^{\circ} - \frac{B}{2} = 180; α = \frac{π}{2} + \frac{B + C}{2}$

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