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Verified answer
A) <BOC = 2 x <CDB karena sama-sama menghadap busur CB= 2 x 25°
= 50°
b) <BAC = <CDB karena sama-sama menghadap busur yang sama yaitu CB
= 25°
c) <AOB = 180° - 50° karena sudut berpelurus
= 130°
2) a ) < AOB = 180° - <OAB - <OBA
= 180° - <OAB - <OBA
= 180° - 40° - 40°
= 100°
b) <OBA = <OAB karena merupakan segitiga sama kaki
= 40°
c) < ACB = 1/2 <AOB
= 1/2 100°
= 50°