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

User Bharath T S
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1 Answer

7 votes
we know that
applying the law of cosines
a²=b²+c²-2*b*c*cos A

in this problem
A=62°
b=15
c=21
so
a²=15²+21²-2*15*21*cos 62°-----> a²=370.23-----> a=19.24

the answer is
a=19.24

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