Q. 124.7( 7 Votes )

# <span lang="EN-US

(i) OB = OC [Radius]

OBC = OCB = 55°

In triangle OCB,

OBC + OCB + BOC = 180°[Sum of angles of triangle]

55° + 55° + BOC = 180°

110° + BOC = 180°

BOC = 70°

(ii) OA = OB [Radius]

OBA = OAB = 20°

In triangle AOB,

OBA + OAB + AOB = 180°[Sum of angles of triangle]

20° + 20° + AOB = 180°

40° + AOB = 180°

AOB = 140°

AOC = AOB - BOC

AOC = 140° - 70°

AOC = 70°

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