How do you determine dpi resolution?

Related questions

1. Is 72 dpi high resolution?
2. Does high dpi make a difference?
3. Which is better quality 600 dpi or 1200 dpi?
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5. What is 300 dpi in pixels?
6. What DPI should I use to scan documents?
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8. Is 72 dpi the same as 300 ppi?
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Tags

1. #inches
2. #height
3. #resolution
4. #printed
5. #devices
6. #width
7. #displayed
8. #various
9. #pixels
10. #image
11. #section
12. #pixel
13. #formula
14. #calculator
15. #which
16. #select
17. #enter
18. #calculate
19. #output
20. #physical