2.5m / 31.71m = 0.0788 I already estimated that quite well.
This will be fun, a totally stupid intermediate level There is almost a meter in the house, plus a terrace on the upper hillside side. So either support the terrace or have the house jut out further, then on the lower hillside side it’s almost enough for a window without a light well. Well suited for a study or guest room. I find a large tree at the top of the hill rather unappealing, it shades very quickly. Although a proper building plan shouldn’t require large trees on a property of this size, with trees over 20m you rather need 1500sqm