anonymous
  • anonymous
Exact measures
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
anonymous
  • anonymous
sin13=5/c, 5*sin13, c=5*sin13
Nnesha
  • Nnesha
hmmm to find 3rd side you should know one angle and one side sin = opposite over hyp right ?

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anonymous
  • anonymous
but the hypotenuse isn't known in this case
Nnesha
  • Nnesha
right i want u to take a few sec and think about is it sin 13 = 5 /c correct ? sin = opposite over hyp and we are looking at angle B which is 13
Nnesha
  • Nnesha
given is a which is 5
anonymous
  • anonymous
no it's not correct! :) I was looking at angle A
anonymous
  • anonymous
so we can use tan77=b/5
Nnesha
  • Nnesha
well sin B = opposite over hyp but the opposite of angle B isn't given
Nnesha
  • Nnesha
|dw:1443995559282:dw|
anonymous
  • anonymous
but we can find out what angle b is.. it's 77 degrees
Nnesha
  • Nnesha
|dw:1443995567775:dw| we don't konw what c equal to and we don't know what is B so you can't use sin for angle B
Jhannybean
  • Jhannybean
\[\angle A = 90^\circ - \angle B\]
Nnesha
  • Nnesha
yes that's correct tan 77 = b/5
Nnesha
  • Nnesha
no wait a sec looking at wrong angle
Nnesha
  • Nnesha
nvm that's correct tan B = b/5
anonymous
  • anonymous
so should i write 5tan(77)?
anonymous
  • anonymous
for the length of b
Nnesha
  • Nnesha
looks good
anonymous
  • anonymous
and for c we can do sin(13)=5/c
anonymous
  • anonymous
I got 5/sin13
Nnesha
  • Nnesha
\(\huge\color{green}{\checkmark}\)
anonymous
  • anonymous
the last one was incorrect :)
Nnesha
  • Nnesha
what which one ?? :o
anonymous
  • anonymous
for length of c
Nnesha
  • Nnesha
well 77+90 =167 subtract from 180 180-167 =13 |dw:1443996138575:dw| looks right
Nnesha
  • Nnesha
or maybe they want u to use given angle which si 77 to finfd length c
anonymous
  • anonymous
I ended up getting 5/cos(77)
Nnesha
  • Nnesha
yes right
Nnesha
  • Nnesha
did you put parentheses for 5/sin(13 ) ?
anonymous
  • anonymous
5/cos(77) was correct :) thank you lots!
Nnesha
  • Nnesha
hmm note for next time only use given angle
Nnesha
  • Nnesha
the*
anonymous
  • anonymous
Got ya :) It's something I need to review!
Nnesha
  • Nnesha
yes right and t trust urself you're really good at math just need little review good lukc o^_^o
Nnesha
  • Nnesha
luck**

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