Предмет: Геометрия, автор: Grigorev1

В равнобедренном треугольнике ABC угол В =120‘.радиус окружности описанной около треугольника равен 2см найдите сторону AB

Ответы

Автор ответа: sadangel2003

6

Треугольник АВС-равнобедр, следовательно уголА=уголС=(180-120)/2=30
Используем теорему синусов:
AB/sin30=2R
sin30=1/2
AB=2*2/2=2

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: gaziz333

помогите срочна по английскому языку

1 год назад

Предмет: Английский язык, автор: arianaxanp0hv9c

4Complete the text with one word in each gap. The (1) __________ extraordinary person I’ve ever met has to be my great grandmother. She’s called Ellie and she’s 98 now but she doesn’t seem any (2) __________ than my grandmother really! She’s bright and intelligent, and her brain still works very fast. The thing about Ellie is that she’s always happy. Sometimes she gets bad pains in her legs but, as she says, ‘life’s too short to grumble’, so she never complains. She’s also always joking and telling me about what she’s seen on TV. She answers all the questions on quiz shows. She’s much (3) __________ at them than me. She was a fashion designer when she was younger and she still wears the most unusual clothes. She loves hats and whenever she goes out in her wheelchair she wears a purple and red one. It is fantastic and suits her very well. She’s given me lots of her old clothes, some dating back 50 years, and they are in perfect condition. I think they must be worth a lot of money. It was Ellie (4) __________ persuaded me to follow my dream and become an artist. I shall always be grateful to her for that. She’s such (5) __________ dear old lady that I’ll miss her a lot when she’s gone. /5

1 год назад

Предмет: Русский язык, автор: evgeha2594

фонетический разбор:
я одержу победу.

1 год назад

Предмет: Алгебра, автор: Olena21212121

Здравствуйте, помогите пожалуйста решите 9 номер. Эта задача она в самом внизу, заранее спасибо огромное

7 лет назад

Предмет: Математика, автор: Ssssddddreeasss

ПОМГИТЕ ПРОШУ!!!! ПОЖАЛУЙСТА!!!!!! РЕШИТЬ 3 ДЕЙСТВИЕ!!!!

7 лет назад