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29.
2x + x = 90°
3x = 90°
x / < B = 30°

pelurus < B = 180° - 30°
pelurus < B = 150°







30. 4x + 6x + 8x = 180°
18x = 180°
x = 10

< ABD = 12x
< ABD = 12 . 10
< ABD = 120°

pelurus ABD = 180° - 120°
pelurus ABD = 60°