Предмет: Геометрия, автор: famafama55

Нужна помощь!
Доказать: треугольник ABC - равнобедренный

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Ответы

Автор ответа: pawlowa394
0
∆АЕС-равнобедренный(т.к АЕ=ЕС)из этого следует,что прямая ЕН-медиана
∆АВН и ∆ВСН
АН=НС
угол АВН=угол НВС(т.к.ЕН-Медиана)
Из этого следует,что они равны. И из этого следует,что ∆АВС равнобедренный
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Вроде так
Автор ответа: famafama55
0
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СРОЧНО ПОМОГИТЕ РЕШИТЬ!
Past Simple или Past Continuous? Поставьте глагол вскобках в правильную форму.
1. What (you/to do) at five o'clock yesterday? - I (to work) in the library. - I (to be) there, too, but I (not to see) you.
2. Nina (to celebrate) her birthday yesterday. Her room looked beautiful, there (to be) many flowers in it. When I(tocome)in, somebody (to play) the piano, two or three pairs (to dance).
3. When I (to come) home yesterday, I (to see) that all my family (to sit) round the table. Father (to read) a letter from my uncle.
4. I (to see) my friend in the street yesterday, but he (to run) for a bus and he (not to have) time to speak to me.
5. We (to have) a postcard from them two days ago. They (to say) they (to have) a marvellous time.
6. Where(you/tobe)yesterday?-I(tobe)athomethewhole day. - How strange. I (to ring) you up at two'clock, but nobody (to answer). - Oh, I (to be) in the garden. I (to read) your book and (not to hear) the telephone.
7. When I (to look) out of the window, it (to rain) heavily and people (to hurry) along the streets.
8. Yesterday I (to work) at my English from five till seven.
9. It (to rain) the whole day yesterday.
10. He (to fall) down and (to break) his leg while he (to play) football.
11. The boy (to work) at his father's factory, (to go) to the Art Institute in Kansas City and many years later he (to found) his own cartoon company. The boy (to be) Walt Disney. 12. At this time yesterday I (to lie) on the soft and (to read) a novel.
13. (You/to be) in Rome in 2001? What (you/to do) there? 14. She (to look) great in her blue velvet dress. She (also/ to wear) her mother's diamonds.
15. The boys (not/to want) to go shopping as they (to watch) the football match on TV.