EM-1324

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

correct to 1 decimal place.

6.5 cm
5.4 cm
8.3 cm
9.6 cm

Sign in to check your answer and see the hint and the worked explanation. Free on PrepLab High.

Loading problem…