Abbie23
Find the length of a if the measure of angle A equals 62 degrees b = 15, and c = 21.



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some1
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dw:1338954330473:dw

some1
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Do you know if one of the angles are 90 degrees? I mean in the problem, not in the picture i just drew.

Abbie23
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Idts

Cortegu10
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i seen this prob before

some1
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ok then i'm not sure. Because you can use sin, cos, tan only when it's a right triangle. sorry :(

Abbie23
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It's okay!

dpaInc
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dw:1338954774600:dw

dpaInc
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do you know the law of cosines?

AravindG
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ya use law of cosines

Abbie23
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Yes, it's Law of Cosines problem

Cortegu10
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use law of sine here

dpaInc
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a^2 = 21^2 + 15^2  2*21*15cosA

AravindG
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\[\huge \cos A =\frac{b^2+c^2a^2}{2bc}\]

Abbie23
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Ok!

AravindG
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:)

AravindG
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no rewards?

Abbie23
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Everyone gets one!

AravindG
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bt i didnt get any medals :(