Uchburchakning ikkita tashqi burchaklari 125° va 135° ga teng. Uning uchinchi tashqi burchagini toping.
100°
Uchburchakning ikkita tashqi burchaklari 130° va 150° ga teng. Uning uchinchi tashqi burchagini toping.
80°
Teng yonli uchburchakning yon tomoniga tushirilgan balandligi bilan ikkinchi yon tomoni orasidagi burchak 20° ga teng. Shu uchburchakning asosidagi burchagini toping.
55°
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