Саппорт от Apple расскажет нам что такое угол 75 градусов
https://support.apple.com/en-us/HT205662
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Clean the keyboard of your MacBook (Retina, 12-inch, Early 2015) and later If your MacBook (Retina, 12-inch, Early 2015) and ater has an unresponsive key, or a key that feels different than the other keys when you press it, follow the instructions below to c ean the keyboard with compressed air. You can clean the keyboard on your MacBook (Retina, 12-inch, Early 2015) and later using the steps below. As you follow these steps, remember to use the straw included with the compressed air to control airflow, and keep the end of the straw about a half-inch away from the keyboard as you spray. Also remember to not invert the air can while you're spraying. 3 Rotate your MacBook to its right side and spray the keyboard again, from left to right.
яблочная геометрия,эпл,саппорт эпл,официальный сай,песочница
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It's not quite vertical - очевидно же.