Final answer:
In a parallelogram, the opposite angles are equal. The measure of angle B is also 56 degrees, while angles C and D are both 124 degrees.
Step-by-step explanation:
In a parallelogram, opposite angles are equal. Therefore, angle B is also 56 degrees.
Also, the sum of the adjacent angles in a parallelogram is 180 degrees. So, angle C is equal to 180 degrees minus angle B, which is 180 - 56 = 124 degrees.
Similarly, angle D is equal to 180 degrees minus angle A, which is 180 - 56 = 124 degrees.
Learn more about Parallelogram angles