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(i) (ii) BDA = 90°[Angle in a semi-circle]

In triangle ABD,

ABD + BDA + BAD = 180°[Sum of angles of triangle]

ABD + 90° + 60° = 180°

ABD + 150° = 180°

ABD = 30°

(iii) ODB = 90° - ODA

ODB = 90° - 60°

ODB = 30°

(iv) In triangle AOD,

AOD + OAD + ODA = 180°[Sum of angles of triangle]

AOD + 60° + 60° = 180°

AOD + 120° = 180°

AOD = 60°

Triangle AOD is an equilateral triangle.

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