Ответ:

  1. a) ∠hk меньше ∠kl на 40°. ∠hk + ∠kl = 180°. ∠kl = ∠hk + 40°. ∠hk + ∠hk + 40° = 180°. 2∠hk = 140°. ∠hk = 70°. ∠kl = 70° + 40° = 110°.
  2. б) ∠hk больше ∠kl на 120°. ∠hk + ∠kl = 180°. ∠hk = ∠kl + 120°. ∠kl + 120° + ∠kl = 180°. 2∠kl = 60°. ∠kl = 30°. ∠hk = 30° + 120° = 150°.
  3. в) ∠hk больше ∠kl на 47°18'. ∠hk + ∠kl = 180°. ∠hk = ∠kl + 47°18'. ∠kl + 47°18' + ∠kl = 180°. 2∠kl = 180° - 47°18' = 132°42'. ∠kl = 66°21'. ∠hk = 66°21' + 47°18' = 113°39'.
  4. г) ∠hk = 3∠kl. ∠hk + ∠kl = 180°. 3∠kl + ∠kl = 180°. 4∠kl = 180°. ∠kl = 45°. ∠hk = 3 × 45° = 135°.
  5. д) ∠hk : ∠kl = 5 : 4. ∠hk + ∠kl = 180°. ∠hk = (5/4) ∠kl. (5/4) ∠kl + ∠kl = 180°. (9/4) ∠kl = 180°. ∠kl = (4/9) × 180° = 80°. ∠hk = (5/4) × 80° = 100°.