anonymous
  • anonymous
Please help... Determine the measure of side c, given: a=3m b=4m B=41deg
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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AravindG
  • AravindG
tried cosine rule ?
anonymous
  • anonymous
im not sure how to do this at all....
AravindG
  • AravindG
do u knw cosine rule ?

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More answers

anonymous
  • anonymous
i have just started learning about it
AravindG
  • AravindG
ok \[\cos B=\dfrac{a^2+c^2-b^2}{2ac} \]
AravindG
  • AravindG
now solve for b
anonymous
  • anonymous
yea good cosine rule,,my answer is b=2.44 (approx.)
dan815
  • dan815
u could use sin law too i think
anonymous
  • anonymous
sorry 1.22
AravindG
  • AravindG
@dan815 sin law wont work cause we need two angles :/
dan815
  • dan815
sin
dan815
  • dan815
use my equation < means angle
anonymous
  • anonymous
actually my options are: 1.6m 4.5m 0.1m 5.7m I thought it was 1.6m?
anonymous
  • anonymous
am I wrong?
anonymous
  • anonymous
actually it was 5.7 after I figured it out.. Thanks though
dan815
  • dan815
did u use my formula!
anonymous
  • anonymous
yea approx.
anonymous
  • anonymous
yes thank you
dan815
  • dan815
np :)
dan815
  • dan815
if u remember that you need atleast 3 pieces of information to solve a triangle and that if the angle given is the angle of the opposite side then you can always use sin law if they give u like side a and b but give you angle C then you have to use cos law if its not a right angle triangle

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