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This question cannot be answered because:

  • ab cannot be 12 cm as well as 11 cm. The question says it is both!
  • It may be assumed that ABCD is a quadrilateral, but there is no further information. Is it a parallelogram or another type of quadrilateral. If the latter, then the length of all four sides, or some of the angles is required.
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Q: What is the perimeter if ABCD if ab is 12 centimeters and 11 centimeters?
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