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DashaSuslova202
@DashaSuslova202
July 2022
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С помощью теоремы синусов, теоремы косинусов и таблицы Брадиса решите треугольник ABC.
a=100, b=300, c=220
угол A=___
угол B=____
угол C=____
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sedinalana
Verified answer
A/sina=b/sinb=c/sinc
cosA=(b²+c²-a²)/2bc
cosB=(a²+c²-b²)/2ac
cosC=(a²+b²-c²)/2ab
cosA=(90000+48400-10000)/(2*300*220)=128400/132000=0,9727
<A≈13гр
cosB=(10000+48400-90000)/(2*100*220)=-31600/44000=-0,7182
<B=180-44≈136гр
<C=180-(<A+<B)=180-(13+136)=180-149=31
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Answers & Comments
Verified answer
A/sina=b/sinb=c/sinccosA=(b²+c²-a²)/2bc
cosB=(a²+c²-b²)/2ac
cosC=(a²+b²-c²)/2ab
cosA=(90000+48400-10000)/(2*300*220)=128400/132000=0,9727
<A≈13гр
cosB=(10000+48400-90000)/(2*100*220)=-31600/44000=-0,7182
<B=180-44≈136гр
<C=180-(<A+<B)=180-(13+136)=180-149=31