ericalexington ericalexington
  • 25-07-2018
  • Mathematics
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Cosines . Find A and include explanation please :)

Cosines Find A and include explanation please class=

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musiclover10045
musiclover10045 musiclover10045
  • 25-07-2018

using the law of cosines:

a^2 = b^2 + c^2 - 2*b*c*cos(A)

a = 90, b = 55, c = 50

90^2 = 55^2 + 50^2 - 2*55*50*cos(A)

8100 = 3025 + 2500 - 5500 * cos(A)

5500 * cos(A) = 3025 + 2500 - 8100

5500 * cos(A) = -2575

cos(A) = -103/220

A = arccos(-103/220)

A = 117.9 degrees

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