I'm not quite sure I understand the question? But, if two people are in one bed, sleeping head to toe, then the other person's feet are likely to touch your face at some time during the night.
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It is rare for someone's feet to touch their face while sleeping in the opposite direction, but it can happen if a person is in an unusual position or has a larger-than-average bed. However, most people have enough space on a standard-sized bed to avoid their feet reaching their face while sleeping opposite.
feet first
It is the opposite: feet in a yard. There are three feet in one yard.
2 person for 10x10 room
sin(angle) = opposite/hypotenuse → hypotenuse = opposite/sin(angle) opposite = rise → hypotenuse = 40ft / sin 16.5° ≈ 140.84 ft
your feet are cold due to the temperature difference which exists between your feet and the tile. The cold sensation is felt as heat energy is transfer to the tile from your feet.