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tw101
 one year ago
Using the law of cosines, in triangle RST, if r=14yd, s=9yd, t=6yd, find m<S
tw101
 one year ago
Using the law of cosines, in triangle RST, if r=14yd, s=9yd, t=6yd, find m<S

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campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2do you know the formula for the law of cosines when finding an angle...?

tw101
 one year ago
Best ResponseYou've already chosen the best response.0No, sorry. Thats all it gave me.:(

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2close,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
 one year ago
Best ResponseYou've already chosen the best response.0okay. Ill plug it into my calculator. one sec.

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2oops correction it should read \[\cos(S) = \frac{r^2 + t^2 s^2}{2 \times r \times t}\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2great so the next step is \[S = \cos^{1}(\frac{151}{168})\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.2that was my solution
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