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Вопрос по математике:
Одна из сторон параллелограмма равна 12 см,большая диагональ - 28 см,а тупой угол - 120 градусов,найти периметр параллелограмма-
Автор:
boo bear
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Пусть AB=12см и AC= 28 см. Из условия Угол ABC = 120 градусов
По теореме косинусов:
AC²=AB²+BC²-2·AB·BC сos120
28²= 12²+BC²-2·12·BC·(-0.5)
BC²+12BC = 640
BC+6=26
BC= 20 cм
Периметр параллелограмма: Pabcd = 2·A +2·BC= 2·12+2·20=40 см
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Вопрос по английскому языку:
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a. picked up
b. grown
c. developed
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a. drug lover
b. drug addict
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a. habit
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a. quit
b. end
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a. of
b. with
c. in
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a. from
b. out of
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Вопрос по английскому языку:
State the functions of the Infinitive in the following sentences. Translate the sentences.
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3. The pipeline to transport oil from the place of production to the place of consumption is under
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4. The problem is to forecast how much water will be produced.
5. The people in the oil industry have to be broadly knowledgeable to find and to apply new
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7. The effect is too small to be detected.
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9. To raise the field production is to increase the volume of oil to be transported.
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11. The new discoveries to be spoken of were made in this field.-
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Вопрос по информатике:
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