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Let O be the circumcenter, H be the orth...

Let `O` be the circumcenter, `H` be the orthocentre, `I` be the incenter, and `I_1, I_2,I_3` be the excenters of acute-angled ` A B Cdot` Column I Column II Angle subtended by `O I` at vertex `A` p. `|B-C|` Angle subtended by `H I` at vertex `A` q. `|(B-C)/2|` Angle subtended by `O H` at vertex `A` r. `(B+C)/2` Angle subtended by `I_2I_3a tI_1` `A` q. `B/2-C`

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