PROVING THAT AOC angle  = ADB angle



➤     draw the OA line, OB line 




2{ACB angle} = AOB angle ---> (1)

2{ADB angle} = AOB angle ---> (2)    (we proved that theorem in  001  post)


(1) = (2)

2{ACB angle} = 2{ADB angle}

ACB angle = ADB angle