The diagram shows the positions of three points $$\(A, B\)$$ and $$\(C\)$$ in a field. Show that $$\(B C\)$$ is $$\(118.1 \mathrm{~m}\)$$, correct to 1 decimal place.
Exam No：0580_s20_qp_41 Year：2020 Question No：7(a)
Answer:
\(\left[B C^{2}=\right] 80^{2}+115^{2}-2 \times 80 \times115 \cos 72\) oe
\(118.06 \ldots\)
\(118.06 \ldots\)
Knowledge points:
E6.4 Solve problems using sine and cosine rules and the area formula for triangles.
Solution:
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