destinyyeager1 destinyyeager1
  • 02-06-2017
  • Mathematics
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A triangle has the following measurements: B=79 degrees a=5ft
c=7ft Use the Law of Cosines to find b

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Luv2Teach
Luv2Teach Luv2Teach
  • 02-06-2017
The law of cosines for this particular situation is b^2 = a^2 + c^2 - 2ac cosB.
Filling in what you know, you have b^2 = 25 + 49 - [2(5)(7)-.1908], which simplifies to b^2 = 74 - 69.8092 which gives you a b^2 value of 4.1908, but you have to take the square root of that so you get a side value for b of 2.05.
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