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Diagonal properties of parallelogram

Problem

A, B, C, D is a square and start overline, O, D, end overline, equals, 18, start text, space, c, m, end text, point
Find start overline, B, D, end overline.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, start text, p, i, end text or 2, slash, 3, space, start text, p, i, end text
start text, space, c, m, end text
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