Предмет: Геометрия, автор: mikhaelplash

сделайье решение полное пожалуйста ​

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Ответы

Автор ответа: ildar502020
1

Ответ:      10 см.

Объяснение:

Дано

ABC - треугольник.  

BC = 7 см.

S(ABC)=20 см ^2

sinC=4/7

***************

AC=b=?

Решение

По 2 сторонам и углу между ними площадь равна

S=1/2(ab*sinC).

1/2(7b*4/7) = 20;

4b=40;

AC=b=10 см.

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