Diameters AD and BC are drawn in a circle centered at point O, angle OAB is 25 °. Find the angle value of the OCD.

univerkov | May 5, 2021 | education

Triangles OAB and OCD are equal on two sides and the angle between them, since OA = OB = OC = OD = R, angle AOB = COD as vertical angles.
Triangles AOB and COD are isosceles, then the angle OCD = OAB = 25.

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