In parallelogram RISK
∠RKS + ∠KSI = 180° [sum of the adjacent angles is equal to 180° in a parallelogram]
120° + ∠KSI = 180°
∠KSI = 180° – 120°
∠z = 60°
In parallelogram CLUE
∠CEU = ∠z = 70° [opposite angles are equal in a parallelogram]
In ΔEOS
70° + ∠x + 60° = 180° [Sum of angles of a triangles is 180°]
∠x = 180° – 130°
∠x = 50°
∴ x = 50°
