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Concept of perimeter

Problem

Each square on the grid is 1 unit square.
A rectangle with 3 rows and 6 columns on a grid. There are 18 unit squares in the rectangle.
What is the perimeter of the shaded rectangle?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
units