Răspuns:
∡ A = ∡ B
∡ C = ∡D
a) <A = 105°;
∡A = ∡ B = 105°
∡C = ∡ D = 180° - 105° = 75°
b) <B = 40°;
∡A = ∡ B = 40°
∡C = ∡ D = 180° - 40° = 140°
c) <C = 70°;
∡C = ∡ D = 70°
∡A = ∡ B = 180° - 70° = 110°
d) <D = 68º.
∡C = ∡ D = 68°
∡A = ∡ B = 180° - 68° = 112°
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