12-10-2020
Mathematics

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12-10-2020

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°°

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