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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