Please find the missing green angle for the quadrilateral using simple geometry and explain your steps. I am not able to use trigonometry for this problem. Thank you.
2026-03-30 12:55:23.1774875323
Missing Quadrilateral Angle
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$ABCD$ is cyclic so the opposite angles are supplementary
$\angle BCD=130°\to \angle ACD=130°-90°=40°$
Or since it's cyclic we can use the inscribed angle. The central angle is already given as $80°$.
So $\angle ACD=\frac12\,80°=40°$