Pixel density tells us how many pixels we can find within a unit of length. And according to the Android developer guide:

  • Low-density screens have 120 PPI.
  • Medium-density screens have 160 PPI.
  • High-density screens have 240 PPI.

A 24" monitor may have low density if its maximum resolution is small, which means we might lose finer details while gaming or editing images/videos. Given the diagonal of a display in inches, d, and its resolution in pixels, w x h, return its pixel density.

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