Предмет: Геометрия, автор: nastymi33

помогите срочно геометрия​

Приложения:

Ответы

Автор ответа: ludmilaksenija2005
0

Ответ:

∠В=45°

Объяснение:

наименьшая сторона АС= 5 см.

АВ=4√2 см

ВС=7 см

найти: ∠В

решение:

из теоремы косинусов:

cos∠B=(AB²+BC²-AC²)/2•AB•BC

cоs∠B=((4√2)²+7²-5²)/2•4√2•7=

=56/56√2=1/√2=√2/2

∠B=45°

Приложения:
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Английский язык, автор: om1009073
Даю 80 балів. Треба вставити слова
1 год назад
Предмет: Английский язык, автор: vikatorialisika87
LANGUAGE Did Oscar and Ling do the same things? Read the sentences 1-4. Complete the questions. 1 Oscar listened to music. Did Ling liter 2 He played some games. Did Ling play games? - Yes, she did. 3 He visited a friend. Did Ling visit a friend? - Yes, she did. 4 He texted his dad. Did Ling her dad? - Yes, she did. Now read sentences 5-9 and complete the questions. 5 Ling went into the sea. Did Oscar до 5 She swam in the sea. Did Oscar S She bought an ice cream. Did Oscar Cho told a scary story Rid Oscar to music? - No, she didn't. into the sea? - No, he didn't. in the sea? - No, he didn't. an ice cream? - Yes, he di- Ling a scary story? - Yes, he d​
1 год назад
Предмет: Окружающий мир, автор: karnafelsolomia
Як складні речовини використовуються у побуті
1 год назад
Предмет: Английский язык, автор: vadimovichva
Здравствуйте! Проблема с решением английского языка. Прочтите следующий текст и выберите верный вариант слов из предложенных ниже. Dear Tom, I’ve just (89) to Rome but I’m still recovering from a (90) terrible flight. We took off two hours late because of bad weather. They told (91) our seat belts and it was (92). For half an hour we flew a (93) storm. It was raining and (94) when we landed in Rome, but I was glad to get into the airport (95). (96), things have (97) since then and I hope the return flight will be more (98). Rome is (99) in the world. I (100) you so much. 89. a) arrival b) arrive c) arrived d) arriving 90 a) real b) realistic c) reality d) really 91. a) to fasten b) fast c) fastener d) fasten 92. a) worried b) worrying c) worry d) worrier 93. a) danger b) dangerously c) dangerous d) dangers 94. a) windy b) wind c) winded d) winding 95. a) built b) build c) building d) builder 96. a) Fortunately b) Fortune c) Fortunate d) The fortune 97. a) improvement b) improve c) improved d) improvident 98. a) comfort b) comfortable c) comforter d) comfortabler 99. a) beautiful b) the most beautiful c) more beautiful c) beautifuler 100. a)miss b)am missing c)missed d) have missed
6 лет назад
Предмет: Математика, автор: MGLOOCHENUJNO
ПОМОГИТЕ ЛОГАРИФМ!!@@​
6 лет назад