When you are building a presentation, how should you lay things out and what are the right ratios. The main thing to realize is that if your slide is 16:9, then it makes some sense to have rectangles that are longer than they are tall.

- The Golden Ratio. This is buried deep in the mathematical world, but the short answer is that if you have a chance to make your flow chart boxes with a ratio of 1:1.618. The answer is pretty technical, but this ratio occurs in nature quite a bit.
- 16:9. This is the high definition screen ratio which comes out to 1:177, so it makes a longer rectangle.
- The leaner rectangle 5:2. This makes a pretty short squat rectangle, so what are some other common ratios, so that is 1:2.5 and is really long.
- Finally, if it really long, then there are not that many common ones, but like 1:2.66 or even 1:3

Then there are ones that are much more squat:

- 4:3. This is common in the photography world so it is 1.3333
- 1:1 is, of course, a complete square

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