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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

As you know angle sum of a quadrilateral = 360°
Hence, angles are: 36°, 60°, 108°, 156°

As all are right angles so the parallelogram is a rectangle

They want you to prove that AC = BD I suppose
AC = AB + BD + DC and therefore AC - BD = AB + DC = AB - CD = 0. done

Definition: A quadrilateral ABCD is a parallelogram if AB || CD and AD || BC. || means parallel.
That is the definiton. There is a proposition saying that if AB = CD
and AD = BC, then we can prove that ABCD is a parallelogram. We just
have to show that they are parallel.