Given,

In a parallelogram ABCD,

∠A =70^∘

∠A + ∠B = 180^∘.. (supplementary angles)

∠B = 180^∘ – 70^∘ = 110^∘

∠A = ∠C and ∠B = ∠D.. (Opposite angles of parallelogram)

∠A = 70, ∠B = 110, ∠C = 70, ∠D = 110^∘