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Let $P$ be a convex polygon with sides $5, 4, 4, 3$. For example, the following:

Consider the shape in the plane that consists of all points within distance $1$ from some point in $P$. If $\ell$ is the perimeter of the shape, which of the following is always correct?

  1. $\ell$ cannot be determined from the given information.
  2. $20\leq \ell < 21$
  3. $21\leq \ell< 22$
  4. $22\leq \ell< 23$
  5. $23\leq \ell< 24$
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