EM-1335

Cosine rule

E Math · Secondary 3 · Hard · Cosine rule

In

\triangle ABC

,

AB = 7\text{ cm}

,

AC = 10\text{ cm}

and

\angle BAC = 48^\circ

. Using the Cosine Rule, find the length of

BC

correct to 1 decimal place.

$7.4\text{ cm}$
$5.3\text{ cm}$
$9.6\text{ cm}$
$12.2\text{ cm}$

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