Answer:D)83
Step-by-step explanation:
ABCD = parallelogram
That means :
BA=CD
BC=AD
=> ∡B=∡D
=>∡C=∡A
—-> ∡D=∡B=40°
=>ΔADC=ΔABC
180=40+57+x
180=97+x
x=180-97
x=83°°
