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b. 180-40=140 drjt
c. 180-100=80 drjt
d. 180-80=100 drjt
e. 180-140=40 drjt
jawaban terbaik ya
= 120°
sudut B = 180° - 40°
= 140°
sudut C = 180° - (60°+40°)
= 180° - 100°
= 80°
sudut D = 180° - 80°
= 100°
sudut E = 180° - 140°
= 40°