For a slanted wall or a wall that ends in a point, always measure the widest and the highest part of the wall. We print the wallpaper as a rectangle. You can then easily trim the slanted corner yourself using a cutting ruler and a knife.
Since walls (especially in older houses) are not always perfectly straight, we recommend adding 10 cm to both the height and the width. This ensures you have enough wallpaper to cover the wall neatly.