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В тетраэдре все ребра равны 2 кронь из 3. Найдите апофему (высота боковой грани)
Ответы 1
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боковая грань - правильный треугольник, у которого гипотенуза = 2√3, а катет лежащий в основании в два раза меньше гипотенузы = 2√3/2=√3
По теореме Пифагора:
апофема= второму катету= √((2√3)²-√3²)=√(12-3)=√9=3
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Автор:
leonard38 - 5 лет назад
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1. He ___ his parents very often.
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14. I will go to the supermarket. They ___ very good oranges there.
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Прочитайте текст. Определите, какие из приведённых утверждений 16-20 соответствуют содержанию текста.
Sausages. Five million sausages are eaten every day in the UK. The dish of sausages and mashed potatoes is called «bangers and mash». Half of British sausages are eaten for an evening meal. More sausages are cooked on Saturday in England than on any other day. People also like sausage sandwiches and barbecued sausages.
Puddings. In the 1960s a French visitor to London wrote, «Ah, what an excellent thing is an English pudding». Sponge puddings are steamed in water in a saucepan. They are like a hot cake and are served with custard. Other favourite puddings are rice puddings, fruit pies and Christmas puddings. Nowadays, families don`t have a pudding every day, but it is still a favourite dish. People often buy ready-made traditional puddings now.
Tea and buscuits. 165 million cups of tea are drunk each day in the UK. Tea is often served with biscuits and 98% of Brits have it with milk. You will find two tea-making things in every British kitchen: the kettle, which is used for boiling the water, and the teapot, which is used for making tea. Nowadays, many teenagers don’t drink tea and prefer cold drinks.
Traditional roast lunch. This is usually served at lunchtime on Sunday. It is when families get together. It consists of roast meat, usually beef, lamb or pork, served with roast potatoes, Yorkshire pudding (a kind of savoury batter), vegetables and lots of gravy! It is often followed by a traditional, too! Sunday lunch is a popular meat to eat out at the pub. Students away from home miss it because a roast lunch means family life.
16. People eat more sausages on Sunday than Monday.
1) True 2) False
17. Sponge pudding is served cold with custard.
1) True 2) False
18. People don’t often cook steamed pudding now.
1) True 2) False
19. 165 million British people drink tea every day.
1) True 2) False
20. British people like eating Sunday roast in a pub.
1) True 2) False
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