whoever is very good at math can you help cause I'm confused

∠C + ∠B = 180° (Given that it is a parallelogram)

∠C : ∠B = 1 : 3 

Total parts = 4
4 parts = 180
1 part = 45°

∠c = 45°
∠ b = 45 x 3 = 135°

∠a = ∠c (Diagonally opposite angles in a parallelogram)
∠a = 45°

∠d = ∠b (Diagonally opposite angles in a parallelogram)
∠d = 135°

Answer: ∠a = 45°, ∠b= 135°, ∠c = 45°, ∠d = 135°