What is the value of the angle marked with x?
21.0
9.1
64°
10.7
18.2

Answer! if you don’t mind, can you explain

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If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.