Предмет: Геометрия, автор: DeFire854

Сторони трикутника АВС дорівнюють 12 см,
20 см і 28 см. Знайдіть косинус найменшого кута
цього трикутника.
УМОЛЯЮ ОТДАЮ ПОСЛЕДНИЕ БАЛЛЫ ПРОШУ ПОМОГИТЕ

Ответы

Автор ответа: zmeura1204
2

Ответ:

cosα=13/14

Объяснение:

Навпроти меньшого кута знаходиться меньша сторона.

а=12см

b=20см

с=28см

сosα=(b²+c²-a²)/(2*b*c)=

=(28²+20²-12²)/(2*28*20)=

=1040/1120=13/14≈0,9286

DeFire854: Велике дякую, ви мене врятували
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