EM-3055

Cosine rule

E Math · Secondary 4 · Hard · Cosine rule

In triangle ABC, the sides are

AB=7\text{ cm}

,

BC=9\text{ cm}

and

AC=12\text{ cm}

. Using the Cosine Rule, find

\angle ABC

correct to 1 decimal place.

$96.4^\circ$
$83.6^\circ$
$63.6^\circ$
$46.4^\circ$

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