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Find angles in congruent triangles

What is the value of xx in the figure shown below?
This image shows two triangles, A B C and B C D, which share side B C to form parallelogram A B D C. Side A C measures 3.4 units. Side A B measures 5.5 units. Side B D measures 3.4 units. Side C D measures 5.5 units. Angle A C B measures 80 degrees. Angle C B A measures 20 degrees. Angle B D C is labeled 'x' degrees.
  • Your answer should be
  • an integer, like 66
  • a proper fraction, like 1/21/2 or 6/106/10
  • a simplified proper fraction, like 3/53/5
  • an improper fraction, like 10/710/7 or 14/814/8
  • a simplified improper fraction, like 7/47/4
  • an exact decimal, like 0.750.75