How can you tell what the resolution of a screen is when is measured by width and height?

The measurements of 1080p in width and height are 1920x1080. How can I translate that backwards? The iPhone XS has 2688x1242. The iPhone XR has 1792x828. Do you determine resolution by height like the measurements for 1080p? So the XR would be better resolution than 720p?

For the purpose of comparisons, you can regard 2688x1242 as 1242p and 1792x828 as 828p, yes.

By refally of what i want

The 1080 in 1080p is the height.
resolution IS height and width. Those iPhones have a non-standard resolution (many phones do now).
XR is technically 828p and XS is 1242p.
both are closer to letterbox than 16x9. Some apps and video players have had issues on these phones. Not very smart, for a smart phone maker…

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