goofy44
13.01.2021 •
Mathematics
Show that b=7
Please help i have 10 minutes to answer
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Ответ:
The value of Cos(60°) is ½
Step-by-step explanation:
B)as we know
b²=a²+c²-2ac.cos(b)
b=√5²+8²-2.5.8×cos(60°)
b=√25+64-80×½
b=√25+64-40
b=√89-40
b=√49
b=7 (proven)
Ответ: