Answer :

In parallelogram RISK


SKR + ISK = 180° [In a parallelogram sum of the adjacent angles is equal to 180°]


120° + ISK = 180°


ISK = 180° - 120°


z = 60°


In parallelogram CLUE


UEC = z = 70° [In a parallelogram opposite angles are equal]


In ΔEOS


70° + x + 60° = 180° [Sum of angles of a triangles is 180°]


x = 180° - 130°


x = 50°


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