the famous Pythagorean Theorem is applied to our smartphone or screen.
it is used to calculate the indicator of image quality.
the indicator is ppi rather than resolution.
this video shows how pythagorean theorem is applied to ppi.
#pythagoreantheorem #resolution #ppi #smartphone

introduction to resolution
the difference between resolution and ppi
the reason why pythagorean theorem is applied.
to calculate the ppi of 12.9-inch iPad