Углы наклона плоскости к плоскостям проекций. Способ перемены плоскостей
Определить углы наклона плоскости, заданной треугольником АВС, к пл. π₁ и пл. π₂.
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![ПОТРЯСАЮЩАЯ ГАЛАКТИКА АНДРОМЕДЫ [M 31, NGC 224]](https://sun9-71.userapi.com/NkwGt3lLGtf_I55s_jACg5NstobUVE8gRUG-CA/3SUbMbUe3AM.jpg)
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