On a coordinate map, a park is at $(4,5)$ and a library is at $(4,1)$. The distance between them along the…

On a coordinate map, a park is at $(4,5)$ and a library is at $(4,1)$. The distance between them along the grid is:
  1. $4$ units
  2. $5$ units
  3. $6$ units
  4. $1$ unit

Solution

Both points have $x=4$, so they lie on a vertical line. Distance $=|5-1|=4$ units.

Asked in: IMO

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