tw101
  • tw101
Using the law of cosines, in triangle RST, if r=14yd, s=9yd, t=6yd, find m
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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campbell_st
  • campbell_st
do you know the formula for the law of cosines when finding an angle...?
tw101
  • tw101
c^2=a^2+b^2/2abcos(
tw101
  • tw101
whoops messed up

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tw101
  • tw101
c=a2+b2﹣2abcosγ
jdoe0001
  • jdoe0001
got picture?
tw101
  • tw101
No, sorry. Thats all it gave me.:(
campbell_st
  • campbell_st
close,this is what you need \[\cos(S) = \frac{r^2 + t^2 - s^2}{2 \times r \times s}\] plug the values in and calculate, the answer is a decimal less than 1. when you get the answer, you then then \[\\S = cos^{-1}(answer)\]
tw101
  • tw101
okay. Ill plug it into my calculator. one sec.
campbell_st
  • campbell_st
oops correction it should read \[\cos(S) = \frac{r^2 + t^2 -s^2}{2 \times r \times t}\]
tw101
  • tw101
okay i got 151/168
tw101
  • tw101
or .90
campbell_st
  • campbell_st
great so the next step is \[S = \cos^{-1}(\frac{151}{168})\]
tw101
  • tw101
26
campbell_st
  • campbell_st
that was my solution
tw101
  • tw101
Thank you so much!

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