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Solve for the side that connects points C and B: B. A 61° 8 30° C using law of cosines I can do it if it had 2 sides and a angle but I can't do it with 2 angles and 1 given side
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38 votes
38 votes
Solve for the side that connects points C and B: B. A 61° 8 30° C using law of cosines I can do it if it had 2 sides and a angle but I can't do it with 2 angles and 1 given side

User Lucasasecas
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1 Answer

19 votes
19 votes

The answer is 7

STEP 1

Get the angle of B


\begin{gathered} STEP 2<p>We make use of sine rule to find Line BC that connects [tex]\begin{gathered} (SinB)/(b)=(SinA)/(a) \\ (Sin89)/(8)=(\sin 61)/(BC) \\ BC\text{ X Sin89= Sin61 X 8} \\ BC\text{ =}\frac{0.8746\text{ X 8}}{0.9999} \\ BC=6.9998 \\ BC\text{ is approx}i\text{mately 7 } \end{gathered}

User Dominating
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