Предмет: Геометрия, автор: danika567415

Апофема правильной четырехугольной пирамиды равна 2а, высота пирамиды равна а. Найдите:

а) сторону основания пирамиды;

б) угол между боковой гранью и основанием;

в) площадь поверхности пирамиды;

г) расстояние от центра основания пирамиды до плоскости боковой грани.

Ответы

Автор ответа: ei076918
0

Ответ:

б) угол между боковой гранью и оснаванием

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Раскроите скобки, употребляя глаголы в Past Simple, Past Continuous u Past Perfect.

1. There (to be) two men in the room. One of them (to write) something while the other (to read) a news-paper. 2. He (not to tell) me that he (to receive) a telegram from her. 3. I (to ask) him if he (to know) where she (to live). I (to say) I (not to know) her ad­dress. 4. He (to ask) me if I (can) give him your ad­dress. 5. She (to say) that he (to give) her the wrong address. 6. I (to ask) him where he (to put) my let­ter. 7. He (to tell) us that they (to spend) all the money. 8. I (to sit) in an armchair and (to think) of my coming trip across the North Sea when the door suddenly (to open) and an old friend of mine whom I (not to see) for a very long time (to enter) the room. 9. She (to come) to see us just at the time when we (to have) dinner. It (to be) the first time I (to see) her. 10. I (to see) him just as he (to leave) the hotel. 11. I (not to see) him before we (to meet) at the con­cert. 12. He (to leave) the house before I (to have) time to ask him anything. 13. After spending sever­al days in Paris he (to feel) lonely and (to want) to return home. 14.1 (to think) he already (to go) home. 15.1 (to find) the old man in the garden. He (to talk) to some children who (to stand) around listening to him. 16. He (to speak) a language we never (to hear) before. 17. He (to tell) me he (to learn) it from the newspaper. 18. He (to enter) the room, (to take) something from the desk and (to go) out.

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