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Вопрос по геометрии:
1.прямоугольная трапеция с основаниями 6 и 10 и большей боковой стороной 5 вращается вокруг большей стороны. Найдите площадь поверхности тела вращения( Число pi=3) (С рисунком, если можно)
2. Решите уравнение
(2sin x+ sqrt(x )) * log3(tgx)=0
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Автор:
dakota
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Тело образованное вращением прямоугольной трапеции вокруг меньшей стороны есть усечённый конус. Площадь боковой поверхности усечённого конуса равна произведению полусуммы длин окружностей оснований на образующую. Т.е. Sбок=(2*пи*r+2*пи*r1)/2*l, где r, r1 - радиусы оснований; l - образующая.
Найдём длину образующей. l=sqrt((6-3)^2+4^2)=5
Sбок=(2*3,14*3+2*3,14*6)/2*5=141,3 кв.ед.
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up
out
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invented
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step by step
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Ответов: 1
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1)
1. They (start) work at 9:00 a m.
16. He (talk) on the phone right now.
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4. He (take) a shower, has breakfast and (go) to school.
5 He (take) his cat to the vet tomorrow.
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8. He (clean) his room every Sunday.
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10. They (buy) a new car.
11 Kate (leave) the sports club late yesterday.
12 Nike usually (come) home, (change) his clothes and (go) out again
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15 I (do) my homework while my brother (play) a computer game for
2)
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14. You (read) this book?
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