EM-1356

Cosine rule

E Math · Secondary 3 · Medium · Cosine rule

In

\triangle ABC

,

AB = 7

cm,

AC = 10

cm and

\angle BAC = 40^\circ

. Find the length of

BC

correct to 3 significant figures.

5.42 cm
6.46 cm
7.32 cm
9.18 cm

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