Class 8 chapter number 3 exercise 3.3 question number 6

Q6 :
Two adjacent angles of a parallelogram have equal measure. Find the measure of each of
the angles of the parallelogram.
Answer :
Sum of adjacent angles = 180°
∠ A + ∠ B = 180º
2∠ A = 180º (∠ A = ∠ B)
∠ A = 90º
∠ B = ∠ A = 90º
∠ C = ∠ A = 90º (Opposite angles)
∠ D = ∠ B = 90º (Opposite angles)
Thus, each angle of the parallelogram measures 90º.