Предмет: Математика, автор: Mataraha

Основания прямоугольной трапеции равны 12 см и 8 см. Самая длинная диагональ равна 13 см. Вычисли длины боковых сторон трапеции. С пояснением пожалуйста.

Ответы

Автор ответа: nastyaMilinsk

делишь трапецию на прямоугольник и треугольник. У треугольника основание равно

12-8= 4

а гипотенуза 13

Отсюда вычисляешь по теореме пифагора высоту треугольника: 13 в квадрате - 4 в квадрате

169-16=153

153+8*5/2=173

То есть площадь трапеции равна полусумме двух оснований трапеции, умноженной на высоту трапеции

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Литература, автор: ppknguh66b

«Сказание о Борисе и Глебе»
Сделать сообщение на тему добра и зла в сказании

7 лет назад

Предмет: Українська мова, автор: avielgavriluk

12. Укажіть розповідне речення.
А. Хто ж од нас у світі дужчий?
Б. Зоре моя вечірняя, зійди над горою.
В. Чи совам зборкати орла?
Г. Берези вздовж дороги обабіч стали в два ряди.
14. Установіть відповідність між словосполученнями та їхніми типами.
1. Осіння пора, свято листопаду. А. Дієслівні.
2. Високо в небі; по-осінньому тепло. Б. Прикметникові.
3. Завітати до лісу; милуватися красою. В. Іменникові
4. Безмежно щасливий, щирий від душі. Г. Прислівникові.
Д. Займенникові.

7 лет назад

Предмет: Английский язык, автор: romanova1910

4. Read the article and be ready to do the task below.
Doreen Fairbairn – The “Brain Drain”
1. When Doreen Fairbairn got her first job at an engineering company in England, she was told, “You’ll never earn a proper salary because you’re a woman.” Doreen had a good degree in physics, but she wasn’t surprised. It seemed normal in those days that good jobs in industry were closed to women.
2. But that manager couldn’t have been more wrong. At fifty-four, Doreen is earning a very good salary, and she’s still moving up in her career.
3. The key to Doreen’s success is that she has never stopped learning. She went back to school almost as soon as she graduated, because she wanted to work in the new transistor industry. After several different jobs, she moved to an American firm called Texas Instruments. A long time before, between classes in college, she had found time to fall in love, and now, years later, when her fiancé had finished his Ph. D. in chemistry, Doreen was married.
4. At that time, a lot of American companies were looking for clever young scientists from abroad. They could usually offer better working conditions and more money than British or other European firms. The stream of brilliant scientists going to America became a flood. It was called “the brain drain”. In 1982, Doreen and her husband joined it, and moved across the Atlantic to Boston.
5. Since then, Doreen and her husband have watched Boston develop into one of the most exciting areas for “hi-tech” industry in the U.S. They have been exciting years for Doreen too. Since 1992, she has worked at Polaroid, where she is now a principal engineer. She is in charge of five other engineers, and it is her job to look after and repair the test equipment that Polaroid uses to build their cameras. Polaroid has sent her all over the United States, to Germany and Holland in Europe, and even to Hong Kong and Japan.
6. “I really enjoy my travels,” says Doreen. “People don’t expect an engineer to be a woman. They don’t know how to treat me. Anyway, they certainly remember the day Mrs. Fairbairn came to visit!”
7. Doreen still hasn’t stopped learning. She has just finished another course of study, and now has her Master of Business Administration degree. But when she’s not working, she knows how to enjoy herself. In her free time, she sings in a choir that performs classical music. Her eyes light up when she talks about it. “Put me with ten or twenty other sopranos,” she laughs, “and I have a lot of fun.”

5. Mark the statements true (T) or false (F).
1. Doreen got her first job at a computer company.
2. Doreen had a degree in physics.
3. Doreen had no time to learn after she graduated.
4. Doreen Fairbairn has never been married.
5. Doreen joined “the brain drain”, and moved to America.

7 лет назад

Предмет: Химия, автор: vika10009

расшифруйте следующую цепочку превращений. назовите соединение А,Б CH3-CH2-CH2-CH2BR---->(над стрелочкой написано KOH СПИРТ)A----> (над стрелочкой написано HBR)Б

10 лет назад

Предмет: Биология, автор: mhgtd

Какое влияние оказывает человек на наземно-воздушную среду?

10 лет назад