anonymous
  • anonymous
help please
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
what exactly?
anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
Do you know 30-60-90 triangle rule?

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anonymous
  • anonymous
no
anonymous
  • anonymous
best way is to use law of cosines
anonymous
  • anonymous
c^2 = a^2 + b^2 - 2ab cos C
anonymous
  • anonymous
plug in 60 for cos(c) (so basically cos(60)) and plug in 3 and 4 for a and b respectively
anonymous
  • anonymous
\[c^2=1^2+4^2-2\times 3 \times 4 \times \cos (60)\]
anonymous
  • anonymous
so replace that 1^2 with 3^2

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