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https://hibara.net/2012/05/03/%d1%83%d0%b3%d0%be%d0%bb-%d1%81%d1%80%d1%83%d0%b1%d0%b0-150-%d0%b3%d1%80%d0%b0%d0%b4%d1%83%d1%81%d0%be%d0%b2/
Угол сруба 150 градусов