Предмет: Математика, автор: iiiiihju2015

Через точки А,В и середину М отрезка АВ проведены параллельные прямые,пересекающие некоторую плоскость а в точках А1,В1,М1 соответственно. Найдите длину отрезка ММ1,если АА1 =13м,ВВ1=7м,причем отрезок АВ не пересекает плоскость а.

Ответы

Автор ответа: kdara112751

Ответ:

Плоскость( АВВ₁А₁) персекает плоскость α по прямой А₁В₁, точка М₁∈А₁В₁. Значит АВВ₁А₁ - трапеция. ММ₁- средняя линия трапеции, ее длина равна полусумме оснований ММ₁= (13+7):2 = 10 м.

Ответ: 10 м.

Пошаговое объяснение:

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A fashion phenomenon

It was about half past seven on а cool morning in 1970. About 200 people were standing in а queue, waiting for the ticket offсе to open. Every minute, more people joined the queue. They all wanted to buy tickets for the next Rolling Stones concert. They were all Stones fans, and lots of them were wearing the same kind of clothes. Nearly all of them were wearing blue jeans.

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Most people under sixty years old have at least one pair of jeans in their wardrobe. Jeans were first made for Californian coal miners in the mid-nineteenth century. They were made out of а strong material called denim. For many years they were worn by miners, cowboys and other working men. These work pants were not known as 'jeans' until the 196Оs. This is when young people began to wear them.

Jeans eventually became so popular that fashion designers started to make them. If а nineteenth-century coal miner went into а jeans shop today, he would be amazed at the range of styles. Не could choose loose or tight jeans. Не could choose straight legs or flares. Не could also choose from blue, black or white jeans. People used to buy jeans because they were practical. Today they are an essential fashion item!

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