Çemberde Açı Problemi

ÖRNEK62: O çember merkezi, $m(\widehat{BAC}) = 105^\circ$, $m(\widehat{CBA}) = 10^\circ$ olduğuna göre, $m(\widehat{ADC}) = \alpha$ kaç derecedir?

A) 15 B) 20 C) 25 D) 30 E) 35

Soruda görsel içerik var: A circular figure with center O. Points A, C, D, E are on the circle. A triangle ABC is formed with a line segment from B to A, A to C, and C to B. There is a line segment BD crossing the circle at E and D. Point D is connected to C. The angle m(BAC) = 105 degrees. The angle m(CBA) = 10 degrees. The angle m(ADC) is marked as alpha.