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smirnovar2016
@smirnovar2016
July 2022
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решите задачи по теореме косинусов
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vivirich
1. а²=b²+c²-2bc cos α
a=7
2. x²=b²+c²-2bc cos α
x=13
3.d²+d²=2a²+2b²
20²+d²=2*9²+2*13²
400+d²=338+162
d²=100
d=10
4.d²+d²=2a²+2b²
13²+19²=2*12²+2b²
530=288+2b²
b=11
5.плохо видно
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Answers & Comments
a=7
2. x²=b²+c²-2bc cos α
x=13
3.d²+d²=2a²+2b²
20²+d²=2*9²+2*13²
400+d²=338+162
d²=100
d=10
4.d²+d²=2a²+2b²
13²+19²=2*12²+2b²
530=288+2b²
b=11
5.плохо видно