EM-1370

Cosine rule

E Math · Secondary 3 · Medium · Cosine rule

In triangle

ABC

,

AB=9\text{ cm}

,

AC=7\text{ cm}

and

\angle BAC=40^\circ

. Find the length of side

BC

correct to 1 decimal place.

5.8 cm
11.3 cm
2.0 cm
7.0 cm

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