In any triangle exterior angle is always equal to the sum of two interior angles.
(i) x = 80° + 50° = 130°
(ii) x + 35° = 110°
⇒ x = 110° – 35° = 75°
(iii) x = 30° + 35° = 65°
(iv) x + 70° = 120°
⇒ x = 120° – 70° = 50°
(v) x + 35° = 65°
⇒ 65° – 35° = 30°
(vi) x = 55° + 40° = 95°
