BloomLocke367
  • BloomLocke367
last question for this unit.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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BloomLocke367
  • BloomLocke367
@geerky42 In triangle XYZ, XY=13. YZ=20, and XZ=25. What is the measure of angle Z?
BloomLocke367
  • BloomLocke367
|dw:1433265703262:dw|
geerky42
  • geerky42
Use law of cosines here.

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Nnesha
  • Nnesha
law of cosine? it's not a right triangle c^2 = a^2 + b^2 -2abcosC
BloomLocke367
  • BloomLocke367
soooo which is what part?
Nnesha
  • Nnesha
|dw:1433265930207:dw|
Nnesha
  • Nnesha
|dw:1433265972665:dw| opposite sides
BloomLocke367
  • BloomLocke367
so 169=400+625-2(20)(25)cos(C)
Nnesha
  • Nnesha
yep looks right
BloomLocke367
  • BloomLocke367
169=1025-1000cosC
Nnesha
  • Nnesha
yep right
BloomLocke367
  • BloomLocke367
and now I have to isolate C, right?
Nnesha
  • Nnesha
yep right cos C
BloomLocke367
  • BloomLocke367
soooo 1000cosC+169=1025 1000cosC=846 cosC=846/1000 C=arccos(846/1000), right?
Nnesha
  • Nnesha
mhm first you have to subtract 1025
Nnesha
  • Nnesha
well nvm it's 856 right ?
BloomLocke367
  • BloomLocke367
I did it a different way, but does it end up being the same?
Nnesha
  • Nnesha
1025 - 169 = ?
BloomLocke367
  • BloomLocke367
856
Nnesha
  • Nnesha
Yep right it's 856/1000
BloomLocke367
  • BloomLocke367
so I got 32.22
BloomLocke367
  • BloomLocke367
that's not an option.... O.O
Nnesha
  • Nnesha
i didn't get 32
Nnesha
  • Nnesha
tryy again
Nnesha
  • Nnesha
it's not 846
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @BloomLocke367 soooo 1000cosC+169=1025 1000cosC=846 cosC=846/1000 C=arccos(846/1000), right? \(\color{blue}{\text{End of Quote}}\) 1025-169 = 856 not 846
BloomLocke367
  • BloomLocke367
dang ittttt I keep doing that today.. writing stuff down wrong.
BloomLocke367
  • BloomLocke367
sorry.
Nnesha
  • Nnesha
it's okay
BloomLocke367
  • BloomLocke367
I got ~31
Nnesha
  • Nnesha
yep
BloomLocke367
  • BloomLocke367
Can you check something for me? just check that my reasoning is correct?
Nnesha
  • Nnesha
okie
BloomLocke367
  • BloomLocke367
nevermind. I got it, don't worry about it
Nnesha
  • Nnesha
mhmm idunno area stuff but 30-6-90 triangle ....make sense that's right i guess looks right
BloomLocke367
  • BloomLocke367
thanks

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