10. The Apple iPhone 6 Plus features a screen with 1920 physical pixels vertically and 1080 pixels horizontally, the same as “Full HDTV” high-definition video. For the iPhone screen to be geometrically similar to a 720p high-definition (just “HD”) screen, which has 720 pixels horizontally, the high-definition screen would have to have _____________ pixels vertically (which it does).