In a parallelogram ABCD, if ∠B=135°, determine the measures of its other angles.
Given,
∠B = 135∘
∠A + ∠B = 180∘ (supplementary angles of parallelogram)
∠A = 180∘ – 135∘ = 45∘
∠C = ∠A = 45∘ (opposite angles of parallelogram)
∠D = ∠B = 135∘