Предмет: Математика, автор: marinabob2014

решение задачи: верхние концы вертикально стоящих столбов удаленных на 12 м друг от друга,соединены перекладиной. высота стоба 4 м,другого 9 м.Найдите длину перекладины

Ответы

Автор ответа: savinalana711
0
Если мы с верхнего конца столба, который равен 4м. проведем воображаемую перпендикулярную линию к столбу, который 9м., то выше у нас получится прямоугольный треугольник с катетами 12м. и 5м. За теоремой Пифагора мы можем легко найти квадрат гипотенузы: с²=а²+b². То есть 12²+5²=144+25=169. Это квадрат гипотенузы. А значит гипотенуза, то есть длина перекладины, которую мы ищем, будет равна √169 или 13 метров.
Похожие вопросы
Предмет: Математика, автор: amalturgunbekova797
Предмет: Математика, автор: kimzhayt
Предмет: Английский язык, автор: ZaBiVnOi1337
ДАЮ 100 БАЛОВ ПОМОГИТЕ ПЛЗ

. Vocabulary. Choose the right adjective of manner.
1. I looked ________ for my keys. *
1 балл
quickly
quietly
easily
slowly
carefully
2. It was so cold so I walked home _______. *
1 балл
quickly
quietly
easily
slowly
carefully
3. We found the address ________. *
1 балл
quickly
quietly
easily
slowly
carefully
4. The baby is sleeping, so please talk _______. *
1 балл
quickly
quietly
easily
slowly
carefully
5. Tina was very tired so she cycled _________. *
1 балл
quickly
quietly
easily
slowly
carefully
II. Grammar. Past Simple vs Past Continuous
Обратите внимание на предложения, нужно выбрать по 2 ответа на каждое предложение. when-когда, while - пока.
1. We ______ when the thieves _____ into the house. *
1 балл
were sleeping
broke
slept
were breaking
2. One thief ______ over while he _______ away. *
1 балл
was falling
ran
was running
fell
3. The police _______ the money while they ________ the garden. *
1 балл
found
were finding
searched
were searching
4. One thief ______ away in a car while the police ________. *
1 балл
weren't looking
was driving
didn't look
drove
III. Reading
Read the story and answer the questions
One day last year , a homeless man, Glen James, found a bag in the door of a shop while he was walking around a shopping centre in Boston. At first , he didn't know what to do, but when he opened the bag he saw it had $40 000 in it so then he took it to the police. Many people thought that Mr James did a wonderful thing. Later, a website decided to raise money to help Mr James because he had no home or job. Finally, they raised over $140 000 from people all over the world. Mr James said " I'm really surprised and so happy. This is going to change my life."
1. What was Glen James doing when he found the bag? *
1 балл
40 000
140 000
was walking around
took it to the police
Другое:
2. What was in the bag? *
1 балл
40 000
140 000
was walking around
took it to the police
3. Who did Mr James give the bag to? *
1 балл
40 000
140 000
was walking around
took it to the police
4. How much did the website raise for Mr James? *
1 балл
40 000
140 000
was walking around
took it to the police