anonymous
  • anonymous
Solve the triangle. A = 51°, b = 11, c = 7 \
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Ever heard the Pythagorean Theorem? ^.^
anonymous
  • anonymous
a2+b2=c2?
anonymous
  • anonymous
well in this case, more like \[\large a^2=b^2+c^2...\]

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anonymous
  • anonymous
but this is no right triangle, so it doesn't really work out... :P
anonymous
  • anonymous
that's where the LAW OF COSINES comes into play :D It's like the Pythagorean Theorem, but BETTER. It works for ANY triangle... ^.^ as long as you're either given all three sides or two sides and the angle between them, like here :P
anonymous
  • anonymous
With just a reeaallly tiny addition to the formula, we get the law of Cosines ^.^\[\Large a^2 = b^2+c^2 \color{red}{-2bc \ \cos(A)}\]
anonymous
  • anonymous
Now you can just solve for a :D
anonymous
  • anonymous
12.8?
anonymous
  • anonymous
@PeterPan

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