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Find the length of a if the measure of angle A equals 62 degrees b = 15, and c = 21.

Mathematics
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|dw:1338954330473:dw|
Do you know if one of the angles are 90 degrees? I mean in the problem, not in the picture i just drew.
Idts

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Other answers:

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

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