anonymous
  • anonymous
Find the length of a if the measure of angle A equals 62 degrees b = 15, and c = 21.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1338954330473:dw|
anonymous
  • anonymous
Do you know if one of the angles are 90 degrees? I mean in the problem, not in the picture i just drew.
anonymous
  • anonymous
Idts

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anonymous
  • anonymous
i seen this prob before
anonymous
  • anonymous
ok then i'm not sure. Because you can use sin, cos, tan only when it's a right triangle. sorry :(
anonymous
  • anonymous
It's okay!
anonymous
  • anonymous
|dw:1338954774600:dw|
anonymous
  • anonymous
do you know the law of cosines?
AravindG
  • AravindG
ya use law of cosines
anonymous
  • anonymous
Yes, it's Law of Cosines problem
anonymous
  • anonymous
use law of sine here
anonymous
  • anonymous
a^2 = 21^2 + 15^2 - 2*21*15cosA
AravindG
  • AravindG
\[\huge \cos A =\frac{b^2+c^2-a^2}{2bc}\]
anonymous
  • anonymous
Ok!
AravindG
  • AravindG
:)
AravindG
  • AravindG
no rewards?
anonymous
  • anonymous
Everyone gets one!
AravindG
  • AravindG
bt i didnt get any medals :(

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