BC^2 = AB^2 - AC^2
BC^2 = 13^2 - 12^2
ВC = 5
tg угла A = BC/AC
tg угла A = 5/12
Ответ: 5/12
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BC^2 = AB^2 - AC^2
BC^2 = 13^2 - 12^2
ВC = 5
tg угла A = BC/AC
tg угла A = 5/12
Ответ: 5/12