r8n73x9999
16.05.2021 03:08

Вычислити значение sin a и to a , если :
1) cos a =5/13
2) соs a = 5/17
3) cos a =0,6 ​​

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Оченьнадо11
26.06.2022 23:10

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Ответ:
MashaMalycheva
06.02.2021 06:06

Назовем трапецию АВСД, где ВС и АД - основания. Из т.С опустим перпендикуляр СЕ к стороне АД. АВСЕ - прямоугольник по построению, значит АЕ=ВС=3. ЕД=АД-АЕ=5-3=2.

Из треугольника СДЕ: угол ДСЕ=180-СЕД-СДЕ=180-90-45=45. Значит треугольник СДЕ равнобедренный, значит СЕ=ЕД=2

 СД^2=CE^2+EД^2=2^2+2^2=8, СД=2*корень из 2

 

 

Тело вращения представляет собой объединение цилиндра с осью АЕ и конуса с осью ДЕ.

S(боковая конуса) = пи*R*L=пи*СЕ*СД=3,14*2*2*корень из 2=12,56*корень из 2 

S(боковая цилиндра) = 2*пи*R*ВС=2*пи*СЕ*ВС=2*3,14*2*3=37,68

S(основания)=пи*R^2=пи*СЕ^2=3,14*2^2=12,56

Все складываем и получаем

S=50,24+12,56*(корень из 2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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