shelby1290
  • shelby1290
WILL FAN & MEDAL!! Find angle A to the nearest whole degree using cosine law.
Mathematics
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
shelby1290
  • shelby1290
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anonymous
  • anonymous
30
shelby1290
  • shelby1290
@cupcakeohla 30 is not the right answer.

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RAM231
  • RAM231
it would be cos(x)=16/42 that would be the equation..... RAM231's sister
shelby1290
  • shelby1290
@RAM231 so....like this? cos(x)=16/42 cos(x)=0.3809 x=cos-1 (0.3809) x=67.6
shelby1290
  • shelby1290
Wait but dont i have to find the length of AC first?
RAM231
  • RAM231
I found the length of the side during the process. and yes. that is correct... as I found out. Is it one of your options? - RAM231's sister
shelby1290
  • shelby1290
This isn't a multiple choice question. But I know that the answers are AC=47 and angle A=17 degrees
shelby1290
  • shelby1290
I just don't know how to get to them
RAM231
  • RAM231
Its RAM231 again... My sister left... she is doing homework so yeah lol. But as she put it in her calculator, she got exactly what you got. she used the pythagorean theorem to get the measurement of side AC. if that makes sense
shelby1290
  • shelby1290
okay can you ask her how she got angle A?
RAM231
  • RAM231
she had to use the inverse cos to find the angle.
shelby1290
  • shelby1290
what's the inverse cos, again? I forgot how to do it
RAM231
  • RAM231
this may help http://www.mathwords.com/c/cosine_inverse.htm
anonymous
  • anonymous
Refer to the Mathematica solution calculation, attached.
1 Attachment

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