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Ответ

Ответ дан
elena20092

Дано: ∠А = 90°; ∠В = 60°; АС = 9

Найти АВ

АВ и АС -катеты треугольника АВС

tg∠B = AC/AB . Отсюда АВ = AС/tg∠B

tg∠B = tg 60° = √3

AB = 9 : √3 = 3√3

Ответ: АВ = 3√3

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