Calculate angle $$\(B A C\)$$ and show that it rounds to $$\(40.42^{\circ}\)$$, correct to 2 decimal places.
Exam No：0580_w21_qp_43 Year：2021 Question No：6(b)
Answer:
\(
[\cos =] \frac{11^{2}+12^{2}-8^{2}}{2 \times 11 \times 12}
\)
\(40.415 \ldots\)
[\cos =] \frac{11^{2}+12^{2}-8^{2}}{2 \times 11 \times 12}
\)
\(40.415 \ldots\)
Knowledge points:
E6.4 Solve problems using sine and cosine rules and the area formula for triangles.
Solution:
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