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Question Number 180365 by Acem last updated on 11/Nov/22

Answered by greougoury555 last updated on 11/Nov/22

$$let\mathrm{\angle }ABC=\beta$$$$\mathrm{\angle }AOC=360°-2\beta$$$$2\alpha +360°-2\beta =180$$$$\iff \beta -\alpha =\frac{360°-180°}{2}=90°$$

Commented by Acem last updated on 11/Nov/22

$$Thanks!$$

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