Perimeter of a semi circle is `pir`.

Now, radius of semi circle `APB` and `CQD` `= 7/2cm`

Radius of semi circle `ARC` and `BSD = 14/2 = 7cm`

`:.` Perimeter of shaded region `(P)=` Perimeter of APB+Perimeter of CQD+Perimeter of ARC+Perimeter of BSD

`P = pi(7/2)+pi(7/2)+7pi+7pi = 21pi = 21**22/7 = 66cm`

`:.` Perimeter of shaded region is `66cm`.