70° - α + 2α + α + 30° = 180°
100° + 2α = 180°
2α = 180° - 100° = 80°
α = 80° : 2 = 40°
70° - α = 70° - 40° = 30° I KĄT
2α = 2 * 40° = 80° II KĄT
α + 30° = 40° + 30° = 70° III KĄT
