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Questions  >>  Olympiad-Math  >>  Class 7  >>  Lines and Angles

ABCD is a quadrilateral whose diagonals intersect each other at the point O such that OA = OB = OD. If ∠OAB = 50^{\circ}, then find the measures of ∠ODA.

( A ) 50^{\circ}
( B ) 40^{\circ}
( C ) 30^{\circ}
( D ) 45^{\circ}

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