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Ammer
@Ammer
July 2022
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Дан треугольник А(5;-4);В(8;8);С(14;0)
Найти внутренний угол АВС.
Спасибо))
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au456
Verified answer
ВА(-3;-12) длина √(9+144)=√153
ВС(6;-8) длина √(36+64)= 10
cos (ABC)= | BA*BC| / |BA| / |BC| = |-3*6+(-12)*(-8)= 78/10/√153=26/(10√17)
1 votes
Thanks 1
au456
arctg(16/13) =arccos(26/(10√17)
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Answers & Comments
Verified answer
ВА(-3;-12) длина √(9+144)=√153ВС(6;-8) длина √(36+64)= 10
cos (ABC)= | BA*BC| / |BA| / |BC| = |-3*6+(-12)*(-8)= 78/10/√153=26/(10√17)