Предмет: Алгебра, автор: Варвара270812

Помогите решить с 30.1 по 30.3, пожалуйста.

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Ответы

Автор ответа: sedinalana

0

30.1
1)S=1/2*12*9*sin30=6*9*1/2=3*9=27см²
2)S=8*7/2=28см²

30.3
1)<A=<ABD=45⇒AD=BD=6см
AC=AD+CD=6+8=14см
S=1/2*BD*AC=1/2*6*14=42см²
2)S=d1*d2/2
D2=2S/d1=2*48/12=8см

Автор ответа: kartew

0

Готово! Ответ на фото:

Приложения:

Варвара270812: А 30.4?

Варвара270812: Помоги решить.

kartew: Готово 30.4: https://ibb.co/faXy1S

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