Предмет: Геометрия, автор: dfgdfgdasda

Помогите решить 35 баллов халявные пж кр до 00:00 нужно сдать

Приложения:

Ответы

Автор ответа: mashuttta
1

Ответ:

9 и 15 м

объяснение во вложении

Приложения:

MrSolution: Зачем было это писать? Он сам должен был до этого дойти.
Автор ответа: MrSolution
0

Ответ:

(см. объяснение)

Объяснение:

Очевидно, что по определению tg находите сначала прилежащий катет, а потом по теореме Пифагора гипотенузу.

Я напишу другое решение, чтобы ты мог сверить ответ, а не просто списать, так как задача простейшая:

1+ctg^2a=1/sin^2a\\sina=\sqrt{\dfrac{1}{1+ctg^2a}}=\sqrt{\dfrac{1}{\dfrac{tg^2a+1}{tg^2a}}}=\sqrt{\dfrac{tg^2a}{tg^2a+1}}=\sqrt{\dfrac{16}{9(\dfrac{16}{9}+1)}}=\dfrac{4}{5}\\AB=\dfrac{12\times5}{4}=15\\cosa=\sqrt{1-\dfrac{16}{25}}=\dfrac{3}{5}\\BC=\dfrac{3\times15}{5}=9

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