EM-1325

Cosine rule

E Math · Secondary 3 · Medium · Cosine rule

In

\triangle ABC

,

AB = 7\text{ cm}

,

AC = 10\text{ cm}

and

\angle BAC = 40^\circ

. Using the cosine rule, find the length of

BC

.

6.5 cm
5.3 cm
8.1 cm
9.6 cm

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